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nist-gov/www.nist.gov/blogs/taking-measure/demystifying-quantum-its-here-there-and-everywhere
Scott Williams 4063bef310 Initital commit.
2025-03-05 18:59:57 +00:00

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<h1 class="nist-page__title">Demystifying Quantum: It’s Here, There and Everywhere</h1>
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<div class="daterange"><time datetime="2024-04-10T12:00:00Z">April 10, 2024</time>
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<span>By: </span>
<a href="/blogs/taking-measure/authors/tara-fortier" hreflang="en">Tara Fortier</a>
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<p>NIST researcher Tara Fortier aligns optics to maximize the signal coming from an optical clock. The signal is measured by a frequency comb.</p>
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<span class="nist-image__credit-label">Credit:</span>
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<p>Recently, you have probably seen the word “quantum” used everywhere — in computing, in names for tech companies, and maybe even for explanations of love and consciousness. &nbsp;</p><p>So ... what is quantum? What is quantum technology? And is it worth all the hype?</p><h2>First of All, What Is Quantum?</h2><p>Quantum, often called quantum mechanics, deals with the granular and fuzzy nature of the universe and the physical behavior of its smallest particles.</p><p>The idea of physical granularity is like your TV image. If you zoom in on the image, you will see it is made of individual pixels. The quantum world is similar. If you zoom in on the details of matter, you will eventually see elementary units of matter and energy with their own unique characteristics. &nbsp;</p><p>In the physical world, matter is made up of atoms as building blocks. Atoms, in turn, are made up of electrons that surround a nucleus. Nuclear particles, such as protons and neutrons, are made up of quarks. &nbsp;</p><p>If you look at an individual pixel, you know nearly nothing about the larger image. However, pixels working together can create enormous complexity in color, shape and even movement from just the pixels’ colors: red, blue, green and off. &nbsp;The same is true of the quantum building blocks in physics.</p><h2>What Does Quantum Taste Like?</h2><p>In fact, the properties of all matter are defined by quantum physics. This is because the physical forces in the atom that bind it together — including the quantum properties of the elementary particles inside the atom — determine the physical and electronic structure of individual atoms. &nbsp;</p><p>More specifically, how the electronic charge is distributed in the atom decides the atom’s electrical properties. The atom’s electronic properties determine how atoms bond to other atoms to create molecules. &nbsp;</p><p>Atoms with similar electronic properties are listed in the same column of the <a href="/blogs/taking-measure/periodic-table-its-more-just-chemistry-and-physics" data-entity-type="node" data-entity-uuid="28751450-e115-4d62-82f4-6902f59c51a3" data-entity-substitution="canonical" title="The Periodic Table: It's More than Just Chemistry and Physics">periodic table</a>, which describes the chemistry of those elements. The electrical structure of molecules decides how molecules work and bond together to create more complex materials, such as metals, liquids, gases and organic compounds. This even includes … you! Yes, you are quantum! &nbsp;</p><p>So, when we experience materials — the way they feel, smell and look — their overall “bulk” properties are determined by the physical structure of quantum’s elemental building blocks and their electrical properties. We are essentially tasting, seeing and feeling the electromagnetic fields of matter!</p><h2>Where Did Quantum Come From?</h2><p>While you may hear a lot about it lately, quantum physics is not new. It was deeply explored and developed around the early 1900s. The <a href="https://www.amnh.org/exhibitions/einstein/legacy/quantum-theory">quantum nature of our world</a> was discovered when mathematical models of the day didn’t match physical observations. &nbsp;</p><p>Interestingly, <a href="https://www.livescience.com/what-are-photons">photons</a>, or particles of light, were discovered by scientists trying to understand the relative intensity of different colors emitted by the newly invented lightbulb. It was a practical discovery indeed!</p><p>Ultimately, scientists learned that physics on the scale of elementary particles — and in the finest scales of energy, space and time — had different features and behaviors than objects we interact with in our ordinary lives, such as baseballs or cars. As mentioned previously, the discovery was a granular universe with unexplored behaviors, such as superposition, entanglement and quantum.</p><div class="nist-callout"><p><a href="https://scienceexchange.caltech.edu/topics/quantum-science-explained/quantum-superposition">Superposition</a> is a dynamic situation where a particle can be in different states at the same time. Superposition is a little like flipping a coin. It is neither heads nor tails, but something in between, until it stops spinning.</p><p><a href="https://www.nist.gov/blogs/taking-measure/gps-laser-pointers-quantum-science-all-around-us">Entanglement</a>, as the name implies, means two things are always connected in a way that correlates with their behavior. For the flipped coin example, correlation in five entangled coins would mean that all five coins would always land either heads up or heads down.</p></div><p>It is this novel nature of quantum mechanics that technologists are trying to use to advance technology in computing, communication, sensing and cryptography.</p><h2>Why Is There So Much Hype?</h2><p>While we’ve known about quantum mechanics for more than a century, quantum-related technology has progressed rapidly in recent years. Currently, a lot of money is being invested in quantum technologies. &nbsp;</p><p>In 2022, the U.S. government committed $1.8 billion in funding for quantum research and development. Private investments in quantum technology in the U.S. have been close to $5 billion in the past two years. &nbsp;</p><p>While that might seem like a lot of money, according to some reports, China has committed <a href="https://www.mckinsey.com/featured-insights/sustainable-inclusive-growth/chart-of-the-day/betting-big-on-quantum">$15 billion, and the European Union has committed more than $7 billion</a>. &nbsp;</p><p>A <a href="https://www.mckinsey.com/capabilities/mckinsey-digital/our-insights/quantum-technology-sees-record-investments-progress-on-talent-gap">recent report by McKinsey</a> reported a potential return on investment of $1.3 trillion by 2035! &nbsp;</p><p>There’s a lot at stake in developing quantum systems. In the future, we may see quantum technology: &nbsp;</p><ul><li>improving computing speed and power;</li><li>creating perfectly secure communications systems through quantum cryptography; and</li><li>improving measurement capabilities by networking quantum sensors, such as atomic clocks and magnetometers. &nbsp;</li></ul><p>While the above capabilities lie somewhere in the future (some more distant than others), even though you might not know it, you interact with quantum technology daily.</p><h2>Quantum in the Bathroom &nbsp;</h2><p>In modern technology, we use the bulk quantum properties of atoms, light and materials to enable technologies, such as lasers, atomic clocks and sensors.</p><h3>Semiconductors</h3><p><a href="/blogs/taking-measure/why-nist-putting-its-chips-us-manufacturing" data-entity-type="node" data-entity-uuid="186f3e24-4eba-4e15-a9e6-709afb2c4f9a" data-entity-substitution="canonical" title="Why NIST Is Putting Its CHIPS Into U.S. Manufacturing">Semiconductors</a> are materials engineered to behave somewhere between metals (conductors) and glass (insulators). Because they can be made to induce electrons to move or block electrons from moving, these powerful materials are used across multiple modern-day technologies as fast electronic switches. &nbsp;</p><p>For example, computers and portable electronic devices can have up to trillions of semiconductors used for computation and data storage. Motion detectors, solar panels, LEDs in lightbulbs and many lasers and sensors are based on semiconductors that convert light to electricity or vice versa. Semiconductors are so ubiquitous that the annual global market was close to $600 billion last year. &nbsp;</p><h3>Motion Detectors</h3><p>Motion detectors, mentioned above, convert light reflected from a surface, like your clothes or body, to create an electrical signal that acts like a switch. This is a quantum phenomenon called the photoelectric effect, which won <a href="https://www.nobelprize.org/prizes/physics/1921/einstein/facts/">Albert Einstein</a> a Nobel Prize. Motion detectors are used to open supermarket doors, turn on a light in your house or turn on a faucet in a public restroom. Yes ... quantum is in your bathroom!</p><h3>Lasers</h3><p>Lasers are so common in modern life that you can buy them for less than $10 to entertain your cat! They are used in construction to keep things level, in medicine for surgery and to control TVs and video boxes remotely. People also use them for data storage or for skin resurfacing and hair removal. &nbsp;</p><p>Lasers work on the quantum principle of <a href="https://www.sciencedirect.com/topics/engineering/stimulated-emission">stimulated emission</a>. In stimulated emission, all the emitted light has the same color or “wavelength.” Mirrors in the laser make sure that the light comes out in the same direction. &nbsp;</p><p>In this case, the wavelengths of light emitted from a <a href="https://www.aps.org/publications/apsnews/200312/history.cfm#:~:text=The%20principle%20of%20the%20laser,wide%20variety%20of%20molecules%2Dby">laser</a> all add together, making a super-strong wave. In this wave, the peaks and valleys of the wave perfectly line up. &nbsp;</p><p>This is a little bit like when all instruments in an orchestra play the same note in unison, creating a powerful, resonant sound wave. When the light waves from a laser all add together, they create a directed and cooperative light source that can be used for laser machining and welding. This light power can also probe and study the electronic structure of materials, called <a href="/blogs/taking-measure/reaching-stars-my-summer-internship-learning-about-spectroscopy-space-and-earth" data-entity-type="node" data-entity-uuid="109ad1cf-6c0c-48b5-808c-1c1c2351e404" data-entity-substitution="canonical" title="Reaching for the Stars: My Summer Internship Learning About Spectroscopy in Space and on Earth">spectroscopy</a>, or can be used to travel massive distances in space. &nbsp;</p><h3>Atomic Clocks and GPS</h3><p>Atomic clocks have been used to help standardize time internationally since 1967. These clocks use the atom’s electronic structure to create a highly regular timing signal by cycling electrons between two quantum energy levels. Because <a href="https://www.nist.gov/blogs/taking-measure/think-you-know-what-second-it-will-likely-change-next-decade">atomic clocks</a> are so accurate and stable, they are central to ensuring accurate navigation in GPS. Using GPS, the internet and cellular towers, the clocks on portable electronics worldwide are synchronized with atomic clocks at NIST and other labs. <span>Fun fact: The </span><a href="/pml/time-and-frequency-division/time-distribution/internet-time-service-its" title="NIST Internet Time Service (ITS)" data-entity-type="node" data-entity-uuid="7f3ea4b1-a4dc-4fb8-ab17-8e78e6a217e4" data-entity-substitution="canonical">internet time service at NIST in Boulder, Colorado</a><span>, which synchronizes electronic devices to U.S. atomic time, receives 100 billion hits per day from devices all over the country.</span></p><h2>How to Join the Quantum Revolution &nbsp;</h2><p>Many of the above applications were developed during what many call the first quantum revolution. Generally speaking, these technologies take advantage of the collective electronic behavior of atoms, material and light.</p><p>Some technologists believe we are entering the second quantum revolution, which will harness the more exotic nature of quantum mechanics, namely quantum entanglement.</p>
<figure class=" align-right nist-image--lightbox nist-image" role="group">
<div data-lightbox="https://www.nist.gov/sites/default/files/styles/2800_x_2800_limit/public/images/2019/12/04/superposition.gif?itok=IPjh4Ed_" data-media-id="445356">
<img alt="animated gif showing superposition by using skateboarders." height="818" loading="lazy" src="/sites/default/files/images/2019/12/04/superposition.gif" typeof="foaf:Image" width="1440">
</div>
<figcaption class="nist-image__caption">Illustration of the quantum physics concept known as “superposition.” In the ordinary classical world, a skateboarder could be in only one location or position at a time, such as the left side of the ramp (which could represent a data value of 0) or the right side (representing a 1). But if a skateboarder could behave like a quantum object (such as an atom), he or she could be in a “superposition” of 0 and 1, effectively existing in both places at the same time.&nbsp; &nbsp; &nbsp;<div class="nist-image__credit">
<span class="nist-image__credit-label">Credit:</span>
N. Hanacek/NIST
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</figure>
<p>Entanglement, superposition and correlated behavior in quantum systems may allow a quantum computer to out-compute classical computers. Quantum systems may also create unbreakable codes for cryptography, which has concerning implications for cybersecurity. Luckily, researchers at NIST and elsewhere are working to develop post-quantum encryption that would be hard even for quantum computers to break. &nbsp;</p><p>On a more fun note, some of the behavior of quantum mechanics will potentially create completely new opportunities that might reveal themselves as more people get creative and involved in quantum technologies. No scientist in the 1960s thought the laser would be used for skin resurfacing or cat toys, but as participation diversifies, more novel and commercial applications begin to surface! &nbsp;</p><p>On this <a href="https://worldquantumday.org/">World Quantum Day</a>, to learn more about quantum and quantum educational opportunities, check out amazing work being done around the <a href="https://q12education.org/">National Q-12 Education Partnership</a>. &nbsp;</p><p>Or just continue asking questions and being curious. Maybe one day, you will market quantum’s next big discovery or figure out how to bring quantum 2.0 to the masses!&nbsp;</p>
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<a href="/blogs/taking-measure/categories/249421">Information technology</a>,
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<a href="/blogs/taking-measure/categories/249281">Quantum information science</a></div>
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<h3 class="nist-teaser__title"><a href="/blogs/taking-measure/authors/tara-fortier"><span>Tara Fortier</span>
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<div class="text-with-summary"><p>Tara Fortier is a physicist and project leader in NIST’s Time and Frequency Division. She leads a research group that performs both basic and applied research in the areas of laser source development for precision optical and microwave metrology of atomic clocks and for quantum networks. Fortier is broadly involved with leadership in several scientific organizations, including NIST’s Women in STEM executive board and as a NIST representative to the White House Office of Science and Technology Policy working group on National Quantum Workforce Development, as well as being a fellow for the Optical Society of America and the American Physical Society. <span>Tara is currently on foreign detail in Sevres, France, working at the Bureau International des Poids et Mesures (International Bureau of Weights and Measures) working as a coordinator for outreach and education in using atomic clocks for coordinated universal time.</span></p></div>
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<span class="nist-comment__author"><span lang="" typeof="schema:Person" property="schema:name" datatype="">Clive Stevens</span></span>
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<span class="nist-comment__date">April 10, 2024 11:41 AM</span>
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<div class="text-long"><p>STEVENS DARK 3D FORCES MAGNOFLUX HYPOTHESIS ©<br />
No dark matter/energy has been found in space as dark massless electro-magnetic forces that God created are needed to balance the WMAP 4.6% atoms in universe result<br />
1 The dark force of mass attraction G is the weakest in deep space volume x,y,z.<br />
2 Electromagnetic dark matter magnoflux spin x,y inertia force of about 6.28G rotates galactic stars around a magnetic black hole hub<br />
3. Electro-static repel about 25G dark energy force in z direction is responsible for expanding the universe as stars are huge + charges.<br />
4. Quantum photons are made of spinning magnoflux 3D momentum. If the inertia energy is not at right angles to the voltage travel direction a Cosine reduction of power is experienced and quantum VAR&#039;s are produced which can carry information ripples at very low cost in energy.</p>
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<span class="nist-comment__author"><span lang="" typeof="schema:Person" property="schema:name" datatype="">Richard Durst</span></span>
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<span class="nist-comment__date">April 10, 2024 6:13 PM</span>
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<div class="text-long"><p>&quot;Demystifying Quantum…&quot; was a very interesting and well-written article. Since I retired (NIST in 1990; Cornell 2006), I have tried to understand quantum mechanics with very limited success. But apparently I am in good company. Einstein called entanglement &quot;spukhafte Fernwirkung&quot; or spooky action at a distance and Feynman said, “If someone says he understands quantum mechanics, it means he hasn’t thought about it deeply enough.” So my quest for understanding goes on…<br />
One minor correction to the article, it is stated that &quot;Atoms with similar electronic properties are listed in the same row of the periodic table, …&quot;. It should have stated &quot;same column of the periodic table&quot;.</p>
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<span class="nist-comment__author"><span lang="" typeof="schema:Person" property="schema:name" datatype="" content="Taking Measure Editor">Taking Measure Editor</span></span>
on
<span class="nist-comment__date">April 11, 2024 8:57 AM</span>
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<span class="nist-comment__parent">| Replied to <a href="/comment/153871#comment-153871" class="permalink" rel="bookmark" hreflang="en">&quot;Demystifying Quantum…&quot; was…</a></span>
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<div class="text-long"><p>Hi, Richard. Thanks for your comment. You are correct, and the blog post has been updated with the right information.</p>
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<span class="nist-comment__author"><span lang="" typeof="schema:Person" property="schema:name" datatype="">Marie Redlin</span></span>
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<span class="nist-comment__date">February 5, 2025 11:26 AM</span>
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<span class="nist-comment__parent">| Replied to <a href="/comment/153871#comment-153871" class="permalink" rel="bookmark" hreflang="en">&quot;Demystifying Quantum…&quot; was…</a></span>
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<div class="text-long"><p>It is fun to hear from an educated person. While I am an RN, I am not that thoroughly educated, but I am fascinated by science. Thank you for your comment. Interestingly, when she made the comment, &quot;row,&quot; in my mind, I visualized a column. I&#039;m not even sure why. I enjoy NIST and am amazed at all I do not know.</p>
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<span class="nist-comment__date">April 12, 2024 10:36 AM</span>
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<div class="text-long"><p>Keep up the good work!</p>
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<span class="nist-comment__author"><span lang="" typeof="schema:Person" property="schema:name" datatype="">Jitso Keizer</span></span>
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<span class="nist-comment__date">April 14, 2024 1:48 PM</span>
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<div class="text-long"><p>Entanglement: In his book The Quantum Theory of Gravitation(2003) Vasily Yanchilin argues that a photon train consists of a whole number of waves. When at the source of entanglement a wave is split into an upper and a lower half later measurements at distances may show the same opposite situation.<br />
Atomic clocks: Yanchilin proposes to measure the ticks of clocks at low and high altitude (which I suggest to be done on the quiet beach and the 700 m high volcano of Saba) and compare after a few weeks. The result will be that near the bigger mass times passes faster and Einstein was wrong. This in agreement with the lens effect: a photon seeks a route when passing mass with as big steps (oscillations of lower frequency) as possible and a minimum of these. However a common clock is too slow and an atomic clock has to be adjusted: Where gravitation (a scalar with one dimension) is less the electrons move to a wider sphere, which has three dimensions. So more energy is involved, which translates into higher frequency.<br />
Remark: Do not talk anymore about twins or trains with almost the speed of light, for since Creation everywhere the same amount of time has passed. But the clocks differ because local gravitation determines speed of physical processes. NIST has none clock precise to a second in a billion years because the universe changes all the time. That american clock may be precise to a billionth per second.<br />
Change: Because equivalence of mass and energy a travelling photon changes the mass distribution in the universe. This requires energy. If that is not received from outside the frequency of the photon drops and redshift appears. Or the time scale may be revised.</p>
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<span class="nist-comment__author"><span lang="" typeof="schema:Person" property="schema:name" datatype="">Olalekan Taliat</span></span>
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<span class="nist-comment__date">April 22, 2024 8:52 PM</span>
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<div class="text-long"><p>Fascinating</p>
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