Monthly Archives: September 2021

Using a quirk of quantum mechanics, researchers have created a beryllium crystal capable of detecting incredibly weak electromagnetic fields. The work could one day be used to detect hypothetical dark matter particles called axions.

The researchers created their quantum crystal by trapping 150 charged beryllium particles or ions using a system of electrodes and magnetic fields that helped overcome their natural repulsion for each other, Ana Maria Rey, an atomic physicist at JILA, a joint institute between the National Institute of Standards and Technology and the University of Colorado Boulder, told Live Science.

Related: The 18 biggest unsolved mysteries in physics

When Rey and her colleagues trapped the ions with their system of fields and electrodes, the atoms self-assembled into a flat sheet twice as thick as a human hair. This organized collective resembled a crystal that would vibrate when disturbed by some outside force.

"When you excite the atoms, they don't move individually," Rey said. "They move as a whole."

When that beryllium "crystal" encountered an electromagnetic field, it moved in response, and that movement could be translated into a measurement of the field strength.

But measurements of any quantum mechanical system are subject to limits set by the Heisenberg uncertainty principle, which states that certain properties of a particle, such as its position and momentum, can't simultaneously be known with high precision.

The team figured out a way to get around this limit with entanglement, where quantum particles' attributes are inherently linked together.

"By using entanglement, we can sense things that aren't possible otherwise," Rey said.

In this case, she and her colleagues entangled the motions of the beryllium ions with their spins. Quantum systems resemble tiny tops and spin describes the direction, say up or down, that those tops are pointing.

When the crystal vibrated, it would move a certain amount. But because of the uncertainty principle, any measurement of that displacement, or the amount the ions moved, would be subject to precision limits and contain a lot of what's known as quantum noise, Rey said.

To measure the displacement, "we need a displacement larger than the quantum noise," she said.

Entanglement between the ions' motions and their spins spreads this noise out, reducing it and allowing the researchers to measure ultra-tiny fluctuations in the crystal. They tested the system by sending a weak electromagnetic wave through it and seeing it vibrate. The work is described Aug. 6 in the journal Science.

The crystal is already 10 times more sensitive at detecting teensy electromagnetic signals than previous quantum sensors. But the team thinks that with more beryllium ions, they could create an even more sensitive detector capable of searching for axions.

Axions are a proposed ultralight dark matter particle with a millionth or a billionth the mass of an electron. Some models of the axion suggest that it may be able to sometimes convert into a photon, in which case it would no longer be dark and would produce a weak electromagnetic field. Were any axions to fly through a lab containing this beryllium crystal, the crystal might pick up their presence.

"I think it's a beautiful result and an impressive experiment," Daniel Carney, a theoretical physicist at Lawrence Berkeley National Laboratory in Berkeley, California, who was not involved in the research, told Live Science.

Along with helping in the hunt for dark matter, Carney believes the work could find many applications, such as looking for stray electromagnetic fields from wires in a lab or searching for defects in a material.

Originally published on Live Science.

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Quantum crystal could reveal the identity of dark matter - Space.com

New research reveals hints of quantum states in tiny proteins called microtubules inside brain cells. If the results stand up, the idea that consciousness is quantum might come in from the cold

By Thomas Lewton

Skizzomat

IF IT is a controversial idea that warm, wet life might exploit quantum magic, thats nothing compared with certain researchers convictions that quantum phenomena might help explain human consciousness.

Orchestrated objective reduction theory (Orch OR), originally proposed by physicist Roger Penrose and anaesthesiologist Stuart Hameroff in the 1990s, seeks to bridge the gulf between physical matter and felt experience. The idea is that consciousness arises when gravitational instabilities in the fundamental structure of space-time collapse quantum wave functions in tiny proteins called microtubules, which are found inside neurons.

It is heady stuff, but if pulling together quantum mechanics, gravity and consciousness in one fell swoop sounds too good to be true, it might be. Orch ORs critics argue that any quantum coherence inside microtubules would fall apart in the warm and noisy environs of grey matter long before it could have any effect on the workings of neurons.

Yet in one tantalising experiment last year, as-yet unpublished, Jack Tuszynski at the University of Alberta in Canada and Aristide Dogariu at the University of Central Florida found that light shone on microtubules was very slowly re-emitted over several minutes a hallmark of quantum goings-on. This is crazy, says Tuszynski, who set about building a theoretical microtubule model to describe what he was seeing.

Gregory Scholes, a biochemist at Princeton University, is studying microtubules for signs of similar quantum effects. Initial experiments point to long-lived, long-range collective behaviour among molecules in the structures. Both groups plan to test whether anaesthetics, which switch consciousness on and off, have any impact on microtubules. There is amazing structure and synchrony in biological systems, says

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Can quantum effects in the brain explain consciousness? - New Scientist

Complementarity relation of wave-particle duality is analyzed quantitatively with entangled photons as path detectors.

The twenty-first century has undoubtedly been the era of quantum science. Quantum mechanics was born in the early twentieth century and has been used to develop unprecedented technologies which include quantum information, quantum communication, quantum metrology, quantum imaging, and quantum sensing. However, in quantum science, there are still unresolved and even inapprehensible issues like wave-particle duality and complementarity, superposition of wave functions, wave function collapse after quantum measurement, wave function entanglement of the composite wave function, etc.

To test the fundamental principle of wave-particle duality and complementarity quantitatively, a quantum composite system that can be controlled by experimental parameters is needed. So far, there have been several theoretical proposals after Neils Bohr introduced the concept of complementarity in 1928, but only a few ideas have been tested experimentally, with them detecting interference patterns with low visibility. Thus, the concept of complementarity and wave-particle duality still remains elusive and has not been fully confirmed experimentally yet.

Figure 1. Double-path single-photon interferometer with controllable source purity used in our ENBS model. Two SPDC crystals, PPLN1 and PPLN2, are pumped and seeded simultaneously by the same pump and seed coherent lasers, respectively, resulting in the emission of two signal photons s1 or s2 for quantum interference detection at PD. Then, conjugate idler photons i1 and i2 provide the which-path (or which-source) information, where the controllable source purity is determined by the overlap between the SPACS of one of the idler modes and the unchanged coherent state of another idler mode. Two idler fields can be detected independently by detectors DA and DB. Credit: Institute for Basic Science

To address this issue, a research team from the Institute for Basic Science (IBS, South Korea) constructed a double-path interferometer consisting of two parametric downconversion crystals seeded by coherent idler fields, which is shown in Figure1. The device generates coherent signal photons (quantons) that are used for quantum interference measurement. The quantons then travel down two separate paths before reaching the detector. The conjugate idler fields are used for extracting path information with controllable fidelity, which is useful for quantitatively elucidating the complementarity.

In a real experiment, the source of quantons is not pure due to its entanglement with the remaining degrees of freedom. However, the quanton source purity is tightly bounded by the entanglement between the generated quantons and all the other remaining degrees of freedom by the relation s = (1 E2), which the researchers confirmed experimentally.

Figure 2. Quantitative complementarity relation of wave-particle duality. (A) Quantitative complementarity relation P2 + V2 = s2 with respect with respect to = 2 / 1 and = 2. Here, path predictability P represents particle-like behavior, while fringe visibility V represents wave-like behavior of the quanton in the double-path interferometer. The totality of complementarity is bounded by the source purity. (B) Source purity s of the quanton (signal photon) and entanglement E between the quanton and which-path (which-source) detector form another complementarity relation s2 + E2 = 1. These two measures are plotted with respect to = 2 / 1 and = 2.Credit: Institute for Basic Science

The wave-particle duality and the quantitative complementarity P2 + V2 = s2 (P, a priori predictability; V, visibility) were analyzed and tested using this entangled nonlinear bi-photon source (ENBS) system, where the superposition states of the quantons are quantum mechanically entangled with conjugate idler states in a controllable manner. It was shown that a priori predictability, visibility, entanglement (thus, source purity, and fidelity in our ENBS model) strictly depend on the seed beam photon numbers. This points to the potential application of this approach for the preparation of distant entangled photon states.

Figure 3. Fringe visibility V and a priori visibility V0 as functions of = 2 / 1 and = 2. Blue points are experimental data taken from the teams recent paper. Experimental data coincide with the visibility V, not a priori visibility V0 across the whole ranges of and ||. This plot validates the teams analysis of the ENBS experimental results in terms of the wave-particle duality and quantitative complementarity relations. Credit: Institute for Basic Science

Richard Feynman once stated that solving the puzzle of quantum mechanics lies in the understanding of the double-slit experiment. It is anticipated that the interpretation based on the double-path interferometry experiments with ENBS will have fundamental implications for better understanding the principle of complementarity and the wave-particle duality relation quantitatively.

Reference: Quantitative complementarity of wave-particle duality by Tai Hyun Yoon and Minhaeng Cho, 18 August 2021, Science Advances.DOI: 10.1126/sciadv.abi9268

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Experimental Confirmation of the Fundamental Principle of Wave-Particle Duality - SciTechDaily

Quantum computing is emerging as the next big thing in the world of technology owing to the advantages it offers over traditional computers, especially when it comes to rapid processing of complex calculations. Quantum computers are opening up new areas of research and are predicting outcomes at a faster pace than traditional computers. This is because unlike traditional computing, where basic information is stored in binaries, that is, in ones or zeros, quantum computing holds data in the form of quantum bits or qubits, that is, in combinations of all possible states, which are also referred to as superposition.

Quantum computing can be leveraged in areas such as artificial intelligence (AI) and machine learning, allowing for increased efficiency and better outcomes. Owing to the ability to generate optimized results, quantum computing is being used across various sectors. NASA is utilizing quantum computing to find safer ways of space travel, controlling air traffic, and so on, as mentioned in a GigaOm article. In 2019, automotive manufacturer Volkswagen used quantum computers to optimize traffic flow in Lisbon, as mentioned in a press release by the company.

Since quantum computing utilizes quantum physics, that is, studying particles at the subatomic level, drug research and discovery can take a leap forward as researchers can study the properties of molecules in detail. Apart from that, the financial sector stands to benefit from quantum computing. Per a report by the IBM Institute for Business Value, quantum computing can be utilized in areas such as risk profiling, predicting and targeting as well as optimization of trading.

Reflective of the positives that quantum computing stands to offer to myriad industries, the quantum computing market is expected to continue to grow. Gartner stated that by 2025, about 40% of large companies are set to undertake initiatives related to quantum computing, as mentioned in a Wall Street Journal article. In fact, per a report by Markets and Markets, the quantum computing market is estimated to witness a CAGR of 30.2% from 2021 to 2026.

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Since quantum computing hardware is expensive and hard to maintain, firms are expected to use the technology via cloud platforms. In 2019, a report by Gartner had stated that by 2023, 95% of organizations will use Quantum Computing as a Service for conducting research on quantum computing strategies.

Quantum computing is emerging as the next step of technological advancement and is set to witness growth going forward. This seems like a prudent time to keep a close watch on companies that can utilize the potential of quantum computing in the coming days. We have selected four such stocks that carry a Zacks Rank #2 (Buy) or 3 (Hold). You can see the complete list of todays Zacks #1 Rank (Strong Buy) stocks here.

Microsoft Corporation MSFT takes a comprehensive approach to delivering quantum and the approach innovates in parallel at all layers of the computing stack, including controls, software and development tools and services. The company also offers Azure Quantum, which assembles and curates several quantum resources for developers and customers across all industries.

Shares of Microsoft have risen 34.8% year to date and it currently has a Zacks Rank #2. The Zacks Consensus Estimate for its current-year earnings has moved up 3.6% over the past 60 days. The companys expected earnings growth rate for the current year is 8%.

NVIDIA Corporation NVDA offers cuQuantum, which is a software development kit of optimized libraries and tools for accelerating quantum computing workflows.

Shares of this Zacks Rank #2 company have gained 73.4% year to date. The Zacks Consensus Estimate for its current-year earnings has risen 6.1% over the past 60 days. The companys expected earnings growth rate for the current year is 68%.

Alphabet Inc.s GOOGL Google offers Quantum AI, which is advancing the state-of-the-art quantum computing and developing tools for researchers for operating beyond classical capabilities. On May 18, Google unveiled its new Quantum AI campus in Santa Barbara, CA, and the campus includes Googles first quantum data center, quantum hardware research laboratories, and quantum processor chip fabrication facilities.

Shares of Alphabet have risen 64.3% year to date and the stock currently carries a Zacks Rank #3. The Zacks Consensus Estimate for its current-year earnings has moved 14.3% north over the past 60 days. The companys expected earnings growth rate for the current year is 73.8%.

Intel Corporation INTC designs, manufactures, and sells essential technologies for the cloud, smart, and connected devices. Intel has been collaborating with QuTech and providing engineering resources for accelerating developments. On May 12, Intel, in collaboration with QuTech, reported that using its cryogenic controller Horse Ridge, it was able to control qubits even in low, cryogenic temperatures, which can lead to solving the problem of quantum scaling or wiring bottleneck.

Shares of Intel have risen 8.2% year to date. The Zacks Consensus Estimate for its current-year earnings has risen 3.7% over the past 60 days. This Zacks Rank #3 companys expected earnings growth rate for the next five years is 7.5%.

Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free reportIntel Corporation (INTC) : Free Stock Analysis ReportMicrosoft Corporation (MSFT) : Free Stock Analysis ReportNVIDIA Corporation (NVDA) : Free Stock Analysis ReportAlphabet Inc. (GOOGL) : Free Stock Analysis ReportTo read this article on Zacks.com click here.Zacks Investment Research

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4 Stocks to Benefit From the Potential of Quantum Computing - Yahoo Finance

Suppose you and your cousin are about to inherit some moneyand you each have a version of the will on your computer. What is the least amount of information your computers must share to determine whether the versions are the same?

This hypothetical scenario raises a communication complexity problem. These problems deal with how much information you need to exchange from computer to computer, orfrom network node to node to perform a certain task or function. The less information transmitted to complete the task, the more energy and time saved and the more privacy is preserved.

Li QianandHoi-Kwong Lo, both professors in the University of Toronto's Edward S. Rogers Sr. department of electrical and computer engineeringin the Faculty of Applied Science & Engineering,and Xiaoqing Zhong, a PhD candidate in the department of physics in the Faculty of Arts & Science,have developed an improved quantum fingerprinting (QF) protocol to more efficiently and securely solve these types of problems, which come up in contexts such as computer networking andVery Large Scale Integration (VLSI) chip design, among other situations.

The teams protocol used the many different frequencies of a photons quantum state a novel approach to encode information. Their paper wasrecently published inNature Communications.

Lets say you and your cousin each have a data file of a million bytes a megabyte, Qian says. In classical protocol, the smallest fingerprint required to determine whether the information is the same to a certainty near 100 per centis found by the square root of the total number of bits. So, a one megabyte file would require the transmission of roughly 300 bytes. With quantum fingerprinting, the amount scales logarithmically: a one megabyte file would only require around three bytes.

The advantage becomes even more pronounced as the files get bigger, Qian adds.

As the data string becomes larger and larger, quantum fingerprinting can drastically reduce the amount of information that you need to exchange.

The QF protocol is achieved by exploiting a property called superposition. In classical communication, a photon encodes information as either a one or zero, but in quantum mechanics a photon can exist in many states between this binary. The possible combinations of these intermediate states are what alloweach single photon to carry far more information, reducing the overall number and saving time, energy and bandwidth.

In addition, it greatly diminishes information leaks, Qian says, which lessens privacy and security concerns.

One challenge of implementing the QF is that the detectors used to register the photons are very sensitive and can produce signal noise. Currently, superconducting photon detectors must be housed in cryogenic dewars, which cool down the environment to milli-Kelvin temperatures. Still, random errors creep in.

The teams improved QF protocol used a technique called multiplexingthe simultaneous sending and measuring of many frequencies of photons to speed up communication time and make QF much less susceptible to detector noise. In the lab, they demonstrated this measurement with six frequencies, but in principle it could be thousands, says Qian.

It makes QF a more practical option, she says. We can use off-the-shelf components: run-of-the-mill semiconductor-based single photon detectors, which are orders of magnitude cheaper than superconductor detectors.

Though QF is accessible technology in todays marketplace, quantum communication is hampered by a lack of compatible infrastructure. Quantum signals are fragileand, though they can coexist with the classical signal in our present fibre optic network, they are easily contaminated. Much of the data terminal equipment in the existing network, such as amplifiers, switches and routers, is not suitable for quantum signals.

More research in progress at the joint labs of Qian and Lo needs to be done to bring quantum and classical signals together in the same optical fibre.

Engineering often finds a balance between the practical and the theoretical, says ProfessorDeepa Kundur, chair of the department of electrical and computer engineering.And Professors Qian and Los research is a great example of this. Theyve fine-tuned a cutting-edge protocol with sights firmly set on the future landscape of telecommunications and by doing soare helping to realize it.

When asked what motivated her to work on quantum technologies, Qian points to the uniqueness of quantum properties.

Theyre simply not found anywhere else in nature, she says. Think of how the unique property of laserscoherent light revolutionized optical technologies in a few short decades. I am convinced the quantum properties of photons will do the same.

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U of T researchers develop new quantum 'fingerprinting' protocol to improve information exchange - News@UofT

Urian B., Tech Times 27 August 2021, 03:08 am

(Photo : Image from Commons.Wikipedia.com) Photons Interact with Pairs of Atoms for the First Time Ever | Breakthrough for Quantum Electrodynamics

Physicists coming from EPFL have finally found a way to be able to get photons to interact with pairs of atoms for the very first time. This particular breakthrough is very important for the field of cavity quantum electrodynamics or QED, a new cutting-edge field leading the way towards quantum technologies.

According to Phys.org, there is still no doubt that they are moving steadily toward an era of technologies that is reportedly based on quantum physics. In order to get there, however, there is still the need to master the ability to make light be able to interact with matter or in more technical terms, photons with atoms.

This has already been achieved to a certain degree giving the scientists the cutting-edge field of cavity quantum electrodynamics or QED, which is already used in quantum networks as well as quantum information processing. Nonetheless, there is still quite a long way to go. A 2014 fiber-optic experiment had two photons interact for the very first time ever.

Current light-matter interactions are supposedly limited to individual atoms, which limits the ability to study them in a particular sort of complex system that is involved in quantum-based technologies. A paper published in Nature noted that researchers from the Jean-Philippe Brantut group at the EPFL's School of Basic Sciences have reportedly found a way in order to get photons to be able to mix with pairs of atoms at certain ultra-low temperatures.

Researchers reportedly used what is most widely known as a Fermi gas, a particular state of matter made of atoms that resembles that of materials' electrons. Brantut explains that in the absence of photons, the gas can reportedly be prepared in a state where atoms interact quite strongly with each other. This would form loosely bound pairs.

Read Also:Penn State's Luminescent Sensor Can Now Detect Terbium, a Rare-Earth Element Used in Solid-State Devices

It was noted that as light is sent onto the gas, some of the pairs can reportedly be turned into chemically bound molecules through absorbing with photons. A particular key concept in this new effect is that it actually happens "coherently." This means that photons can be absorbed in order to turn a pair of atoms directly into a molecule, then emitted back, then finally reabsorbed a number of times.

This would imply that the pair-photon system forms a brand new type of "particle" which is technically an excitation and is called "pair-polariton," according to Brantut. It was noted that this is made possible in their system, where photons are confined in a certain "optical cavity" which is a closed box that forces them to interact strongly with atoms. Scientists have been counting how many protons were produced since the Big Bang.

The particular hybrid pair-polaritons take on a number of properties of photons. This means that they can be measured with certain optical methods. They also reportedly take on some of the properties of the Fermi gas, just like the number of atom pairs that it had originally before the additional photons.

Related Article:'Green Steel,' aka Carbon-Free Steel, Has Come Sooner than Expected

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Photons Interact with Pairs of Atoms for the First Time Ever | Breakthrough for Quantum Electrodynamics - Tech Times

One day, Elsa Einstein, wife of the famous Albert, saw her husband wander over to the piano, jot down some notes, keep playing, then disappear into a room for two weeks. When he emerged, he had a working theory of relativity that would change physics forever.

What Albert Einstein probably experienced when playing his beloved musicwhich fed directly into the beauty of his sciencewas a state of flow that musicians, artists, and anyone really, can reach when their minds are lubricated and ready to unleash unbridled creativity. That creativity can be translated into jazz music, quantum mechanics, and business strategy.

Not to detract from the importance of his physics, but I put it to you that Albert was as much a genius for giving us another equation: Creativity = intelligence having fun. My creative agency has played with that idea in our quest to help organizations achieve progressive thinking and extreme collaboration toward any goal.

Companies will commit to intelligence any day of the week, but in the meantime, the fun often gets lost. But your best ideas dont come to you when youre hunched over a computer. They spring up on you when youre on a run, having a beer with a friend, or chilling in the shower.

To circle back to our science theme: Theres a chemical reason for that. When cortisol, the stress hormone, floods our brains, it makes us close in on ourselves. But when we feed our brain dopamine, endorphins, and a whole lot of other goodies, we are lubing it up to get into that state of flow.

So, we want businesses to start thinking about how to generate a better brain cocktail for their employeesa concept inspired by Jennifer Aaker of Stanford and her book Humor, Seriously. That brain cocktail should disinhibit team members full potential, making them comfortable enough to share those radical ideas your business needs to power forward.

Imagine youre daydreaming in the shower. Youre completely relaxed, and your brain is sinking into deeper levels of thinking. What youre doing there is creating a safe space where you can just be yousing, think, stare . . . . Thats what we refer to as psychological safety. Now, how do we create that in a room full of our peers, or on a Zoom call full of strangers?

The first ingredient of our brain cocktail is the social hormone oxytocin, also known as the trust or cuddle hormone. Oxytocin is the only hormone that needs other people around to be released, and is responsible for that toasty, calm feeling we get when were with people we care about.

So how do we trigger it? Its about making connections through talking, laughing, sharing a moment, or even just eye contact. One way you can do this is taking a joint break during a team meeting, in which everyone turns their cameras on, makes eye contact, and shares a funny or embarrassing story they experienced or heard recently. Sometimes, if a team member seems stuck, it may be a good idea to put them in a space with someone they cherish, like a partner, and tell them to just spend time with them. Theyll come back refreshed and in a better frame of mind.

Oxytocin can also be released in the thrill of making new connections, by simply bringing together team members who wouldnt usually cross paths to brainstorm a business strategy together.

When we get the oxytocin flowing, were generating trust, but also effective collaboration. Not only that, were also allowing our bodies to fight back against cortisol, the hormone connected with stress and fear, allowing for greater optimism and social ease.

You and your friend are riffing off each other after watching the latest Fast and Furious movie. Each of you is coming up with more and more ridiculous one-liners; youre giggling like children, and you feel a warm, contented feeling. And youre at it for a good 10 minutes.

Thats dopamine coursing through your bodythe happy feeling thats so rewarding you keep wanting more, so you stay engaged with whatever it is youre doing. Dopamine can be triggered by something exciting or hilarious, by singing or playing a game. Its what concentrates your thoughts and gets you lost in the moment.

We can release dopamine when working in a team by simply bringing in more fun, whether by transforming a task or by sprinkling some in. For example, you can start a meeting with a funny video, or interrupt with a pop quiz. Or, gamify your meetings agenda so that whenever a team member contributes an idea towards that new marketing strategy, they enter a raffle for a free latte (even though your office already has courtesy coffees). That chemical will generate great ideas, and make people latch onto them so they can continue to grow.

When we think about endorphins we think about sports, running, and exercising. Thats all true, but you can also work them up by standing up instead of sitting. Having sex. Making things with your hands. Dancing. For people with physical disabilities, it can be released through social touch and hugs (which doubles it up with oxytocin). Endorphins generate a euphoric feeling, and that release actually gives people better clarity of thought, and puts them in a relaxed state.

In a workplace, that is a crucial stage in working toward an aha momentthose moments where all the cobwebs are brushed away to reveal a singular, genius idea. Oxytocin prepares you, dopamine gets you focused, and endorphins help you prioritize and crystalize an idea.

A good way of upping endorphin levels during the workday is to encourage people to take a walking meeting, in which they join a Zoom call from their phones while out on a walk. In-office meetings can be paused for a shake it out break; also, you could add a few workout machines to the office and explain to your team how important endorphins are to creative productivity.

We get used to thinking and ideating within the same molds, and sometimes we dont understand how to get unstuck. Our own bodies provide the solution. We have everything we need to unlock the (perhaps rusty) doors to our weird and wonderful imaginationswe just need to be our own bartender in making that cocktail come to life.

Paul Charney is the founder and CEO of Funworks, a creative agency using psychology, neuroscience, and fun to generate extreme collaboration and progressive design thinking.

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The fascinating brain chemistry behind team collaboration and unbridled creativity - Fast Company