### Advancing Quantum Information Science: Unlocking Secrets

October 12, 2021

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Displaying 1 - 25 of 151

October 12, 2021

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June 18, 2019

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, , ,

We dominate how Rydberg atoms and the phenomena of electromagnetically induced transparency can be used to record a musical instrument in real time as it is played. We discuss how this ``entertaining'' example of an application of quantum physics is timely

December 1, 2017

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The two most troublesome issues with the SI as currently defined involve the artifact kilogram (kg) and the electrical units. Defining the kg as exactly equal to the mass of the International Prototype Kilogram (IPK) poses severe difficulties in scaling

December 1, 2017

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The U.S. National Institute of Standards and Technology (NIST), along with other NMIs, is preparing for a new era in the history of metrology made possible by the growing use of quantum-based standards and measurements. This development will dramatically

December 1, 2017

Author(s)

The United States National Institute of Standards and Technology (NIST) is playing a major role in the worldwide effort to base the International System of Units (SI) on fundamental constants. In many cases, units will be redefined in terms of invariant

July 28, 2017

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, , , , , , ,

Researchers at the National Institute of Standards and Technology(NIST) estimate the value of the Planck constant as h = 6.62606994(10) x 10^-34 Js, hence with relative standard uncertainty 15.3 x 10^-9. This measurement result is based on over 17,000

September 28, 2016

Author(s)

, , , Shisong Lee, , , ,

Using a watt balance and a frequency comb, a mass-energy equivalence is derived. The watt balance compares mechanical power measured in terms of the meter, the second, and the kilogram to electrical power measured in terms of the volt and the ohm. A direct

June 21, 2016

Author(s)

, , , , , , , Shisong Li

A precise instrument, called a watt balance, compares mechanical power measured in terms of the meter, the second and the kilogram to electrical power measured in terms of the volt and the ohm. A direct link between mechanical action and the Planck

December 21, 2011

Author(s)

, Erhai Zhao, Noah Bray-Ali, , Indubala Satija

We present a novel technique for detecting topological invariants -- Chern numbers -- from time-of-flight images of ultra-cold neutral atoms. The Chern number of fermions in a lattice potential depends on magnetic field (for neutral atoms, generated by an

October 27, 2011

Author(s)

, , , Ippei Danshita, ,

We suggest an experimentally feasible procedure to observe paired and counterflow superfluidity in ultra-cold atom systems. We study the time evolution of one-dimensional mixtures of bosonic atoms in an optical lattice following an abrupt displacement of

September 15, 2009

Author(s)

Philip Johnson,

, ,
We show that virtual excitations of neutral bosons to higher vibrational states in a three dimensional optical lattice generate effective, tunable, attractive three-body interactions. These effective processes can quickly decohere coherent states held in

August 24, 2009

Author(s)

, , Ippei Danshita, , ,

We study the quantum phases of mixtures of ultra-cold bosonic atoms held in an optical lattice that confines motion or hopping to one spatial dimension. The phases are found by using Tomonaga-Luttinger liquid theory as well as the numerical method of time

June 1, 2009

Author(s)

, , , , , , , , ,

We have demonstrated a polarization encoded, fiber-based quantum key distribution system operating at 850 nm in the B92 protocol. With a quantum bit transmission rate i.e. optical pulse driving frequency of 625 MHz and a mean photon number of 0.1, we

June 1, 2009

Author(s)

, , , , D J. Rogers, ,

Quantum cryptography asserts that shared secrets can be established over public channels in such a way that the total information of an eavesdropper can be made arbitrarily small with probability arbitrarily close to 1. As we will show below, the current

June 1, 2009

Author(s)

, , , , Hai Xu, , , , , ,

A complete fiber-based polarization encoding quantum key distribution (QKD) system based on the BB84 protocol has been developed at National Institute of Standard and Technology (NIST). The system can be operated at a sifted key rate of more than 4 Mbit/s

July 21, 2008

Author(s)

,

The attractive Fermi-Hubbard Hamiltonian is solved via the Bogoliubov-de Gennes formalism to analyze the ground state phases of population imbalanced fermion mixtures in harmonically trapped two-dimensional optical lattices. In the low density limit the

February 2, 2008

Author(s)

, , ,

We present a model that generalizes the Bose-Fermi mapping for strongly correlated 1D bosons in an optical lattice, to cases in which the average number of atoms per site is larger than one. This model gives an accurate account of equilibrium properties of

January 7, 2008

Author(s)

,

We analyze the ground state phases of two-component population- andmass-balanced but trap-imbalanced fermion mixtures as a function of interactionstrength from the weak attraction Bardeen-Cooper-Schrieffer (BCS) to the strongattraction Bose-Einstein

September 13, 2007

Author(s)

K Szymaniec, W Chalupczak, S Weyers, R. Wynands,

,
The frequency shift due to atomic collisions is a major, and in some cases the dominant, limitation to the accuracy of caesium fountain primary frequency standards. A correction for this shift is usually obtained by measuring the frequency of the standard

April 13, 2007

Author(s)

K Szymaniec, W Chalupczak,

, , S Weyers, R. Wynands
We have observed that the collisional frequency shift in primary caesium fountain clocks varies with the clock state population composition and, in particular, is zero for a given fraction of the |F = 4, mF = 0> atoms, depending on the initial cloud

September 1, 2006

Author(s)

D J. Rogers,

, , , , , , , ,
August 1, 2006

Author(s)

, , , , , , , , , ,

We previously demonstrated a high speed, point to point, quantum key distribution (QKD) system with polariztion coding over a fiber link, in which the resulting cryptographic keys were used for one-time pad encryption of real time video signals. In this

June 19, 2006

Author(s)

, , , , , , , , , ,

A complete fiber-based polarization encoding quantum key distribution (QKD) system based on the BB84 protocol has been developed at National Institute of Standard and Technology (NIST). The system can be operated at a sifted key rate of more than 4 Mbit/s

April 21, 2006

Author(s)

, , , , , , , , ,

NIST has developed a high-speed quantum key distribution (QKD) test bed incorporating both free-space and fiber systems. These systems demonstrate a major increase in the attainable rate of QKD systems: over two orders of magnitude faster than other

April 1, 2006

Author(s)

, , , , , , , , ,

NIST has developed a high-speed quantum key distribution (QKD) test bed incorporating both free-space and fiber systems. These systems demonstrate a major increase in the attainable rate of QKD systems: over two orders of magnitude faster than other