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Physical Measurement Laboratory

Quantum Measurement Division

News and Updates

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Desktop Cosmology: A Model of the Expanding Universe

April 23, 2018

When the universe was very young – about a trillionth of a trillionth of a trillionth of a second after the Big Bang – it underwent a sudden explosive expansion

Comparison of Future Realizations of the Kilogram - Final Report

March 15, 2018

The Pilot Study — read 2016 article details — was completed in late 2016 and the Final Report was published on the BIPM website (PDF) in June of 2017. The main

NIST Sharpens the 'Charpy' Test to Make a More Precise Impact on Industrial Materials

February 26, 2018

A decade before an iceberg shattered the hull plates of the Titanic and half a century before a plague of brittle fractures started sinking Liberty ships during

Person holding wallet card showing the values of fundamental constants being used for revising the International System of Units, the modern metric system.

Bringing the World Closer to Revised Measurement System, Scientists Update Four Key Fundamental Constants

October 23, 2017

Paving the way for transforming the world’s measurement system, an international task force has determined updated values for four fundamental constants of

Distant Exoplanets Revealed by Light from Wobbling Stars

October 16, 2017

Ask most folks what they would need to find planets orbiting distant stars, and very few will list a bottle of iodine. Yet that element plays a vital role in

Driving the Universal Quantum Bus

September 12, 2017

NIST scientists have achieved a world record in detecting the intensity of an ultra-faint source of light, equaling the capabilities of the deep-space

Close up shot of the NIST Kibble balance with two kilograms stacked on it

New Measurement Will Help Redefine International Unit of Mass

June 30, 2017

Using a state-of-the-art device for measuring mass, researchers at the National Institute of Standards and Technology (NIST) have made their most precise

Quantum Thermometer or Optical Refrigerator?

June 22, 2017

In an arranged marriage of optics and mechanics, physicists have created microscopic structural beams that have a variety of powerful uses when light strikes

Intrinsic Properties: The Secret Lives of Accelerometers

May 30, 2017

Accelerometers — devices that measure change in velocity — are built into automobiles, airplanes, cell phones, pacemakers, and scores of other products

The New Standard for Resistance Standards?

May 22, 2017

Contrary to the popular maxim, resistance is not futile. But it is quantized: The ratings of the heat-making resistors in your hair dryer or toaster ultimately

Mystery of the Dark Solitons

February 24, 2017

When your heart beats, blood courses through your arteries in waves of pressure. These pressure waves manifest as your pulse, a regular rhythm unperturbed by

School building with overlay of units and constants

Heads Up, High School Class of '19: New Measurement Unit Definitions Are Coming

January 23, 2017

Next year, scientists expect to change the way we define the basic units with which we measure our universe. An article by scientists at the National Institute

Man standing behind big silver equipment

Disseminating the New Kilogram: An International ‘Dry Run’

November 28, 2016

When the kilogram, the world’s basic unit of mass, gets a new definition in 2018, it will be based not on a physical artifact but a constant of nature. However

Universe’s Constants Now Known with Sufficient Certainty to Completely Redefine the International System of Units

November 22, 2016

Fundamental constants are physical quantities that are universal in nature. For example, the speed of light in vacuum and the charge of a single electron are

Big G Redux: Solving the Mystery of a Perplexing Result

November 16, 2016

If you spend time in physics research circles, you may have heard of the big G controversy. The universal constant of gravitation, G – affectionately known as

This artist’s conception imagines the proposed ring of atoms as cars on a beltway.

Atomic Beltway Could Solve Problems of Cosmic Gravity

November 14, 2016

When is a traffic jam not a traffic jam? When it's a quantum traffic jam, of course. Only in quantum physics can traffic be standing still and moving at the

Move Over, Lasers: Scientists Can Now Create Holograms from Neutrons, Too

October 20, 2016

For the first time, a team including scientists from the National Institute of Standards and Technology (NIST) have used neutron beams to create holograms of

NIST Patents Single-Photon Detector for Potential Encryption and Sensing Apps

September 15, 2016

Individual photons of light now can be detected far more efficiently using a device patented by a team including the National Institute of Standards and

Crystal Unclear: Why Might This Uncanny Crystal Change Laser Design?

August 26, 2016

Laser applications may benefit from crystal research by scientists at the National Institute of Standards and Technology (NIST) and China's Shandong University

Measuring Tiny Forces with Light

August 24, 2016

Photons are bizarre: They have no mass, but they do have momentum. And that allows researchers to do counterintuitive things with photons, such as using light

NIST's Newest Watt Balance Brings World One Step Closer to New Kilogram

June 21, 2016

A high-tech version of an old-fashioned balance scale at the National Institute of Standards and Technology (NIST) has just brought scientists a critical step

A man in a hardhat standing on top of the million-pound weight stack with a person standing at the bottom.

Million-Pound Deadweight Machine Officially Open for Business

June 2, 2016

The last few bolts were tightened just weeks ago – by hand. Now fully restored, NIST's 4.45 meganewton (one million pounds-force) deadweight machine – the

Powered by Quantum Cycles: Cold-Atom Pump

May 25, 2016

By manipulating the behavior of particles at a quantum level, scientists at the Joint Quantum Institute (JQI, a research partnership of NIST and the University

NIST's Million-Pound Weight Stack Restoration is Complete

April 25, 2016

It's official: NIST's 4.45-million newton (equivalent to one million pounds-force) deadweight machine – the largest in the world – is back in one piece after a

new instrument for accelerometer testing

Precision Testing for MEMS Accelerometers

April 8, 2016

They activate airbags. Keep aircraft correctly positioned in flight. Detect earthquakes or sudden vibrations in failing machinery. Guide military hardware

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