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Search Publications

NIST Authors in Bold

Displaying 401 - 425 of 3643

Investigating Bias in Maximum Likelihood Quantum State Tomography

February 8, 2017
Author(s)
Scott C. Glancy, Hilma M. Vasconcelos, George B. Silva
… Maximum likelihood quantum state tomography yields estimators that, in spite of … investigates bias in the widely used maximum likelihood quantum state tomography. Our goal is to understand how the … bias, maximum likelihood, quantum state tomography … Investigating Bias in Maximum Likelihood Quantum State Tomography …

Observation of an isomerizing double-well quantum system in the condensed phase

January 10, 2020
Author(s)
Varun Verma, Jascha A. Lau, Arnab Choudhury, Li Chen, Dirk Schwarzer, Alec M. Wodtke
… Molecules are quantum objects; therefore, isomerization fundamentally involves quantum states bound within a molecular potential energy … points have been characterized. However, to observe the quantum nature of isomerization, we must study model systems … quantum, condensed phase, superconducting nanowire, …

Arbitrarily fast quantum computation with bounded energy

March 6, 2017
Author(s)
Stephen P. Jordan
… uncertainty principle states that the minimum time for a quantum system to evolve from a given state to any orthogonal … quantum computing, quantum speed limit, uncertainty principle … Arbitrarily fast quantum computation with bounded energy …

Preparation and coherent manipulation of pure quantum states of a single molecular ion

May 11, 2017
Author(s)
Chin-Wen Chou, Christoph Kurz, David B. Hume, Philipp N. Plessow, David R. Leibrandt, Dietrich G. Leibfried
… structure, this level of measurement precision and quantum-state control has been reached only in a very limited … we experimentally demonstrate a general method for pure quantum state preparation and coherent manipulation … initial states. In this way, we solve both the problems of quantum state preparation and detection in an isolated …

Mid-infrared molecular spectroscopy in the quantum noise limit

March 31, 2016
Author(s)
David A. Long, Adam J. Fleisher, Qingnan Liu, Joseph T. Hodges
… A cavity ring-down spectrometer was used to reach the quantum noise limit in the mid-infrared spectral region. Quantum noise was observed not only in the individual … Quantum noise, Cavity ring-down spectroscopy, Mid-infrared … Mid-infrared molecular spectroscopy in the quantum noise limit …

Interaction-driven quantum Hall wedding cake-like structures in graphene quantum dots

August 24, 2018
Author(s)
Christopher Gutierrez, Daniel T. Walkup, Fereshte Ghahari Kermani, Cyprian Lewandowski, Joaquin R. Nieva, Kenji Watanabe, Takashi Taniguchi, Leonid Levitov, Nikolai Zhitenev, Joseph A. Stroscio
… Despite long-standing interest, direct observation of quantum-relativistic matter under ambient conditions was … can yield unique insights into the behaviour of quantum- relativistic matter under extreme conditions. … graphene, quantum dots, scanning tunneling microscopy, scanning …

Multiscale Modeling of Germanium Quantum Dots in Silicon

December 30, 2005
Author(s)
Vinod Tewary, David T. Read
… A method is described for multiscale modeling of a quantum dot in a semiconductor containing a free surface. The … nonlinear discrete lattice effects inside and close to the quantum dot, discrete lattice structure of the solid at the atomistic scale near the quantum dot and reduces asymptotically to the macroscopic …

Tightly Confined Surface Acoustic Waves as Microwave-to-Optical Transduction Platforms in the Quantum Regime

September 26, 2022
Author(s)
Ryan DeCrescent, Zixuan Wang, Poolad Imany, Robert Boutelle, Corey McDonald, Travis Autry, John Teufel, Sae Woo Nam, Richard Mirin
… Surface acoustic waves (SAWs) coupled to quantum dots (QDs), trapped atoms and ions, and point defects have been proposed as quantum transduction platforms, yet the requisite coupling … Gaussian SAW cavities at ∼3.6 GHz on GaAs in the quantum regime, with mode volumes approaching 6λ^3. Employing …

Observation of chiral photocurrent transport in the quantum Hall regime in graphene

May 24, 2021
Author(s)
Glenn S. Solomon, Olivier Gazzano, Bin Cao, Jiuning Hu, David B. Newell, Tobias Huber, Michael Gullans, Mohammad Hafezi, Tobias Grass
… a powerful tool to investigate non-equilibrium physics in quantum Hall systems. Moreover, the length scale associated … graphene through photocurrent measurements in the integer quantum Hall regime. We observe that the photocurrent … graphene, Integer quantum Hall, photocurrent …

Bimodal Size Distribution of Self-Assembled InGaAs Quantum Dots

September 23, 2002
Author(s)
Solveig Anders, C. S. Kim, Benjamin D. Klein, Mark W. Keller, Richard Mirin
… energy level quantization in self-assembled InGaAs quantum dots that are embedded In a GaAs matrix. We use … These techniques suggest that the size distribution of the quantum dots contains two well-separated peaks. Transmission … distribution and further shows that the big and the small quantum dots have different shapes. In addition, we use an …

Experimental Demonstration of a Detection-time-bin-shift Polarization Encoding Quantum Key Distribution System

June 6, 2008
Author(s)
Lijun Ma, Tiejun Chang, Alan Mink, Oliver T. Slattery, Barry J. Hershman, Xiao Tang
… of a single photon detector between two photon bases in a quantum key distribution (QKD) system. This scheme can … sifted keys at a rate of more than 1 Mbit/s with a quantum bit error rate (QBER) lower than 2% over 1.1 km of … detection-time-bin-shift, quantum cryptography, quantum key distribution …

Quantum-correlated photon pairs generated in commercial 45 nm complementary metal-oxide semiconductor microelectronics

July 7, 2015
Author(s)
Cale M. Gentry, Jeff Shainline, Mark W. Wade, Martin Stevens, Shellee D. Dyer, Xiaoge Zeng, Fabio Pavanello, Thomas Gerrits, Sae Woo Nam, Richard Mirin, Milos A. Popovic
… Correlated photon pairs are a fundamental component of quantum photonic systems. While pair sources have previously … electronics. Here we report the first demonstration of quantum-correlated photon pair generation in a device … of commercial CMOS microelectronics as an advanced quantum photonics platform where state-of-the-art high-speed …

Optimized heat transfer at exceptional points in quantum circuits

October 7, 2019
Author(s)
Matti Partanen, Jan Goetz, K-Y Tan, Kassius Kohvakka, Vasilii Sevriuk, Russell Lake, Roope J. Kokkoniemi, Joni Ikonen, Dibyendu Hazra, Akseli Makinen, Eric Hyyppa, Leif Gronberg, Visa Vesterinen, Matti Silveri, Mikko Mottonen
… Superconducting quantum circuits are potential candidates to realize a large-scale quantum computer. The envisioned large density of integrated … quantum physics, microwave circuits, Hamiltonians, … circuit, dissipation, photon-assisted tunneling, qubits, quantum electrodynamics …

Quantum key distribution at GHz transmission rates

February 11, 2008
Author(s)
Alessandro Restelli, Joshua C. Bienfang, Alan Mink, Charles W. Clark
… Quantum key distribution (QKD) channels are typically … We demonstrate a QKD system operating continuously at a quantum-channel transmission rate of 1.25 GHz, with dedicated … free-space optical communication, quantum key distribution, single-photon … Quantum key distribution at GHz transmission rates …

Fault-tolerant quantum memory using low-depth random circuit codes

January 10, 2025
Author(s)
Jon Nelson, Gregory Bentsen, Steven Flammia, Michael Gullans
… random circuit codes possess many desirable properties for quantum error correction but have so far only been analyzed … subject to noise. This is sufficient for fault-tolerant quantum memory since these encoded states can then be used as … quantum error correction, quantum computing, statistical …

Recovering quantum gates from few average gate fidelities

October 24, 2018
Author(s)
Yi-Kai Liu, Ingo Roth, Richard Kueng, Shelby Kimmel, David Gross, Jens Eisert, Martin Kliesch
… Characterizing quantum processes is a key task in and constitutes a challenge for the development of quantum technologies, especially at the noisy intermediate … Compressed sensing techniques achieve full tomography of quantum channels essentially at optimal resource efficiency. …

Ion Optical Clocks and Quantum Information Processing

May 1, 2003
Author(s)
David J. Wineland, James C. Bergquist, Till P. Rosenband, Piet Schmidt, Wayne M. Itano, John J. Bollinger, Dietrich G. Leibfried, W Oskay
… in spectroscopy and (2) implement sympathetic cooling and quantum state transfer techniques, which might be used to … atomic clock, atomic frequency standard, optical clock, quantum information processing, quantum-state engineering, trapped ions … Ion Optical Clocks and Quantum Information Processing …

Photon Emission from a Cavity-Coupled Double Quantum Dot

July 16, 2014
Author(s)
Y.-Y. Liu, Karl Petersson, J. Stehlik, Jacob Taylor, Jason Petta
… We study a voltage biased InAs double quantum dot (DQD) that is coupled to a superconducting … Quantum dot, circuit QED, microwave superconductors, quantum computing … Photon Emission from a Cavity-Coupled Double Quantum Dot …

Detection of fractional quantum Hall states by entropy-sensitive measurements

March 17, 2025
Author(s)
Nishat Sultana, Robert Rienstra, K Watanabe, T Taniguchi, Joseph Stroscio, Nikolai Zhitenev, D Feldman, Fereshte Ghahari Kermani
… per charge carrier1 which can probe strongly interacting quantum systems ranging from black holes2 to the fractional quantum Hall effect (FQHE)3,4. This makes thermopower a … to excess entropy in certain even denominator fractional quantum Hall (FQH) states5,6. In this article, we report the …

Bilayer crystals of trapped ions for quantum information processing

August 16, 2024
Author(s)
Samarth Hawalder, Prakriti Shahi, Allison Carter, Ana Rey Ayala, John J. Bollinger, Athreya Shankar
… Trapped ion systems are a leading platform for quantum information processing, but they are currently … properties of the normal modes open new opportunities in quantum information processing that are not straightforward … dimensions and lays the foundation for a new generation of quantum information processing experiments with multilayer 3D …

Inverse design of a polarization demultiplexer for on-chip path-entangled photon-pair sources based on single quantum dots

August 21, 2023
Author(s)
Emerson Melo, William Eshbaugh, Edward Flagg, Marcelo Davanco
… Epitaxial quantum dots can emit polarization-entangled photon pairs. If … polarized transition dipole moments of a single embedded quantum dot to two independent waveguides. An optimized quantum dot polarization demultiplexer is predicted to … Nanophotonics, quantum emitters, inverse design, entanglement …
Displaying 401 - 425 of 3643
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