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NIST Authors in Bold

Displaying 251 - 275 of 3642

Quantum algorithm for simulating the wave equation

January 15, 2019
Author(s)
Pedro C. Costa, Stephen P. Jordan, Aaron Ostrander
… We present a quantum algorithm for simulating the wave equation under … conditions. The algorithm uses Hamiltonian simulation and quantum linear system algorithms as subroutines. It relies on … quantum algorithm, partial differential equations … Quantum algorithm for simulating the wave equation …

Higgs Amplitude Mode in a Two-Dimensional Quantum Antiferromagnet near the Quantum Critical Point0

July 4, 2017
Author(s)
Tao Hong, Masashige Matsumoto, Yiming Qiu, Wangchun Chen, Thomas R. Gentile, Shannon M. Watson, Firas F. Awwadi, Mark M. Turnbull, Sachith E. Dissanayake, Harish Agrawal, Rasmus Toft-Petersen, Bastian Klemke, Kris Coester, Kai P. Schmidt, David A Tennant
… Spontaneous symmetry-breaking quantum phase transitions play an essential role in current … excitations in the broken-symmetry phase near the quantum critical point can be characterized by fluctuations … identify the Higgs amplitude mode in a two-dimensional quantum S=1/2 coupled spin ladder compound C 9 H 18 N 2 CuBr …

Spin decoherence in a two-qubit CPHASE gate: the critical role of tunneling noise

November 27, 2018
Author(s)
Peihao Huang, Neil M. Zimmerman, Garnett W. Bryant
… two-qubit logic gate, which is necessary for universal quantum computing. Here, we study the decoherence of two … spin qubits due to charge noise in a silicon double quantum dot (DQD) used for a two-qubit logic gate. We … npj Quantum Information … spin qubit, quantum dot, two-qubit gate, decoherence, charge noise …

Single-photon detection using a quantum dot optically gated field-effect transistor with high internal quantum efficiency

December 19, 2006
Author(s)
Mary A. Rowe, Eric Gansen, Marion Greene, Danna Rosenberg, Robert Hadfield, Todd E. Harvey, Sae Woo Nam, Mark Su, Richard Mirin
… We investigate the operation of a quantum dot, optically gated, field-effect transistor as a … sensitivity, a linear response, and an internal quantum efficiency of up to [68±18] % at 4 K. Given the noise … can be chosen so the device operates with an internal quantum efficiency of [53(+ or -)11]% and dark counts of …

Quantum computational advantage with a programmable photonic processor

June 1, 2022
Author(s)
L.S. Madsen, F. Laudenbach, M.F. Askarani, F. Rortais, T. Vincent, J.F.F. Bulmer, F.M. Miatto, L. Neuhaus, L.G. Helt, Matthew Collins, Adriana Lita, Thomas Gerrits, Sae Woo Nam, V.D. Vaidya, M. Menotti, I. Dhand, Zachary Vernon, N. Quesada, J. Lavoie
… The demonstration of quantum computational advantage is a key milestone in the race to build a fully functional quantum computer. This milestone involves showing that a particular quantum device can perform a well-defined computational task … Photonic processor , quantum computer, Gaussian Boson Sampling, quantum …

Synchronized source of indistinguishable photons for quantum networks

May 2, 2024
Author(s)
Nijil Lal Cheriya Koyyottummal, Ivan Burenkov, Ya-Shian Li-Baboud, Jabir Marakkarakath Vadakkepurayil, Paulina Kuo, Thomas Gerrits, Oliver T. Slattery, Sergey Polyakov
… to an external clock, for the use in distributed quantum networks. We characterize the indistinguishability of … duration of ≈ 35 ps. Our source enables scalable quantum protocols over multi-node, long-distance optical … Quantum Network, Indistinguishable Photons, Synchronization, …

Quasistatic Antiferromagnetism in the Quantum Wells of SmTiO 3 /SrTiO 3 Heterostructures

February 20, 2018
Author(s)
Ryan F. Need, Patrick B. Marshall, Eric Kenney, Andreas Suter, Thomas Prokscha, Zaher Salman, Brian Kirby, Susanne Stemmer, Michael J. Graf, Stephen D. Wilson
… The magnetic properties of high-density SrTiO 3 quantum wells embedded within the antiferromagnetic Mott … origin of the pseudogap behavior in this behavior in this quantum critical oxide heterostructure with those observed in … Nature Partner Journals Quantum Materials …

Ultra-high spectral resolution spectrometer for single photon source characterization

May 14, 2018
Author(s)
Lijun Ma, Oliver T. Slattery, Xiao Tang
… In future quantum communication systems, single photons will be … and accurate wavelengths for efficient interaction with quantum memories. Spectral characterization of such single … spectrum measurement, quantum communication, single photon source, quantum memory, …

Quantum metrology algorithms for dark matter searches with clocks

June 7, 2024
Author(s)
Muhammad Zaheer, Naleli Matjelo, David Hume, Marianna Safronova, David Leibrandt
… Quantum metrology involves improving the sensitivity of a quantum sensor to a signal while circumventing sensitivity to noise using algorithms from quantum information science. Atomic clocks are among the most … quantum metrology, optical clock, nuclear clock, thorium …

Bounds on quantum communication via Newtonian gravity

January 15, 2015
Author(s)
Jacob M. Taylor, Dvir Kafri, G J. Milburn
… induced in the system when the communication cannot convey quantum information. This provides a tight constraint from … grounds on any theory of gravity that does not allow quantum communication. … quantum communication, gravitation … Bounds on quantum communication via Newtonian gravity …

Quantum harmonic oscillator spectrum analyzers

June 25, 2021
Author(s)
Jonas Keller, Panyu Hou, Katherine C. McCormick, Daniel Cole, Stephen Erickson, Jenny Wu, Andrew C. Wilson, Dietrich Leibfried
… essential for the control of harmonic oscillators in the quantum regime. We measure the noise spectrum of a quantum harmonic oscillator from low frequency to near the … Quantum harmonic oscillator, Spectrum analyzer … Quantum harmonic oscillator spectrum analyzers …

Phase stabilization with single photon detection for quantum networks

October 29, 2024
Author(s)
Jabir Marakkarakath Vadakkepurayil, Daehyun Ahn, FNU Nur Fajar Rizqi Annafianto, Ivan Burenkov, Abdella Battou, Sergey Polyakov
… optical links is pivotal for the functionality of diverse quantum communication protocols. However, conventional phase … methods use classical optical signals that may corrupt quantum signals propagating in the same optical fiber link … a 50 % duty cycle time division multiplexing, we enable quantum payloads to coexist within the same communication …

Coherence of Quantum Superpositions Through Coupling to Engineered Reservoirs

January 1, 2002
Author(s)
C J. Myatt, B E. King, Q A. Turchette, C A. Sackett, D Kielpinski, Wayne M. Itano, C Monroe, David J. Wineland
… The theory of quantum mechanics applies to closed systems. In such ideal … their environment, with the consequence that macroscopic quantum superpositions (as illustrated by the Schrodinger's … offer the possibility of observing the decoherence of such quantum superpositions. Here we present measurements of the …

Ultrafast optical properties of lithographically defined quantum dot amplifiers

February 10, 2014
Author(s)
Luis Miaja Avila, Varun B. Verma, James J. Coleman, Richard P. Mirin, Kevin L. Silverman
… the ultrafast optical response of lithographically defined quantum dot amplifiers at 40 K. Recovery of the gain mostly … longer timescale, representative of relaxation between quantum dot levels and carrier recombination. We also measure … lasers, quantum dots … Ultrafast optical properties of lithographically defined quantum dot amplifiers …

High-Speed Quantum Communication Testbed

December 1, 2002
Author(s)
Carl J. Williams, Xiao Tang, M Hiekkero, J Rouzard, R Lu, A Goedecke, Alan L. Migdall, Alan Mink, Anastase Nakassis, Leticia S. Pibida
… We describe the current status of the NIST Quantum Communication Testbed (QCT) facility. QCT is a facility for exploring quantum communication in an enviornment similar to that projected for early commercial implementations: quantum cryptographic key exchange on a gigabit/second …

Adiabatic optimization without local minima

March 1, 2015
Author(s)
Stephen P. Jordan, Michael Jarret
… works have investigated the circumstances under which quantum adiabatic optimization algorithms can tunnel out of … Quantum Information & Computation … quantum algorithm, adiabatic, computational complexity …

The Complexity and Verification of Quantum Random Circuit Sampling

October 29, 2018
Author(s)
Adam Bouland, William J. Fefferman, Chinmay Nirkhe, Umesh Vazirani
… A critical milestone on the path to useful quantum computers is the demonstration of a quantum computation that is prohibitively hard for classical computers -- a task referred to as quantum supremacy. A leading near-term candidate is sampling … Random Circuit Sampling, RCS, quantum circuits …

Classical simulation of Yang-Baxter gates

November 3, 2014
Author(s)
Stephen P. Jordan, Gorjan Alagic, Aniruddha Bapat
… group Bn for every n ≥ 2. If we view such an operator as a quantum-computational gate, then topological braiding corresponds to a quantum circuit. A basic question is when such a representation affords universal quantum computation. In this work, we show how to classically …

Experimental speedup of quantum dynamics through squeezing

April 17, 2024
Author(s)
Shaun Burd, Hannah Knaack, Raghavendra Srinivas, Christian Arenz, Alejandra Collopy, Laurent Stephenson, Andrew C. Wilson, David Wineland, Dietrich Leibfried, John J. Bollinger, David Allcock, Daniel Slichter
… that a broad class of interactions involving quantum harmonic oscillators can be made stronger (amplified) … as well as Hamiltonians coupling the oscillator to another quantum degree of freedom such as a qubit, covering a large range of systems of interest in quantum information and metrology applications. Importantly, …

Targeted enrichment of 28Si thin films for quantum computing

March 9, 2020
Author(s)
Ke Tang, Hyun S. Kim, Aruna N. Ramanayaka, David S. Simons, Joshua M. Pomeroy
… is regarded as an ideal host material for semiconducting quantum computing due to the lack of 29Si nuclear spins. However, the detailed mechanisms for quantum decoherence and the exact level of enrichment needed for quantum computing remain unknown. Here we use hyperthermal …

Smaller Circuits for Arbitrary n-qubit Diagonal Computations

February 25, 2003
Author(s)
Stephen Bullock, I L. Markov
… phases are often required in applications.Constructing quantum circuits for diagonal computations using standard … Quantum Information & Computation … character, diagonal quantum computation, relative phase …

Quantum Dots Precisely Placed by Controlled Flow

August 24, 2010
Author(s)
James A. Liddle
… flow to achieve nanometer precision placement of single quantum dots. … Nanofabrication, control, quantum dots … Quantum Dots Precisely Placed by Controlled Flow …

Smaller Two-Qubit Circuits for Quantum Communication and Computation

March 20, 2003
Author(s)
V V. Shende, I L. Markov, Stephen Bullock
… arbitrary two-qubit unitary operation using any of several quantum gate libraries with small a priori upper bounds on gate counts.Using quantum circuit identities, we improve an earlier lower bound … procedures on two-qubit operators that are useful in quantum algorithms and communication protocols. With …
Displaying 251 - 275 of 3642
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