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Search Publications

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Displaying 201 - 225 of 3642

Electronic Properties of Quantum-Dot Molecules

April 1, 2003
Author(s)
W Jaskolski, M Zielinski, Garnett W. Bryant
… We investigate the electronic structure of several double quantum dot systems: (I) hetero-dot artificial molecules … two vertically stacked pyramidal self-organized InAs/GaAs quantum dots. The calculations are performed using the … significant coupling between the nanocrystals that form quantum-dot molecule. When two quantum dots are close enough, …

Evolution of the Shapes of InAs and InGaAs Quantum Dots

January 1, 2001
Author(s)
Richard P. Mirin, Alexana Roshko, M. van der Puijl, Andrew G. Norman
… The exact shape of self-assembled quantum dots is still a controversial subject in the … the energy levels and electron wavefunctions in the quantum dots. We will describe reflection high energy … microscopy (TEM) measurements on both InAs and InGaAs quantum dots growth on (100) GaAs substrates. …

Thermal release tape-assisted semiconductor membrane transfer process for hybrid photonic devices embedding quantum emitters

April 19, 2022
Author(s)
Cori Haws, Biswarup Guha, Edgar Perez, Marcelo Davanco, Jin Dong Song, Kartik Srinivasan, Luca Sapienza
… found or exploited within a single system. In the realm of quantum and nanophotonics, for instance, one might want to … functionalities by combining efficient classical and quantum light emission available in III-V semiconductors, … dimensions up to about 260 um x 80 um, containing InAs quantum dots, on a gold substrate. We show that the presence …

Spectroscopy of atomic and molecular ions using quantum logic

June 25, 2006
Author(s)
Piet Schmidt, Till P. Rosenband, Jeroen Koelemeij, David Hume, Wayne M. Itano, James C. Bergquist, David J. Wineland
… Recently developed techniques for quantum computation using trapped ions allow unprecedented … laser cooling and detection. Furthermore, we discuss how quantum logic can be used to cool molecules to their … atom trapping and cooling, quantum computation, quantum information processing, quantum …

A Source for Mesoscopic Quantum Optics

October 22, 2015
Author(s)
Georg Harder, Timothy J. Bartley, Adriana Lita, Sae Woo Nam, Thomas Gerrits, Christine Silberhorn
… The nature of quantum decoherence renders the observation of nonclassical … photons have been used in a broad range of contexts, from quantum enhanced metrology, fundamental tests of local realism to quantum information tasks such as Boson sampling and quantum …

Quantum dot semiconductor optical amplifiers

July 1, 2000
Author(s)
Richard P. Mirin, D. J. Blumenthal
… semiconductor optical amplifier using self-assembled quantum dots as the gain medium is proposed and analyzed. … Cross-gain modulation is greatly reduced when the quantum dots are electronically uncoupled. … quantum dots, semiconductor optical amplifiers … Quantum dot semiconductor optical amplifiers …

Two-qubit silicon quantum processor with operation fidelity exceeding 99%

April 6, 2022
Author(s)
Michael Gullans, Adam Mills, Charlie Guinn, Anthony Sigillito, Mayer Feldman, Nielsen Erik, Jason Petta
… Silicon spin qubits satisfy the necessary criteria for quantum information processing. However, precision is … control. We use two qubits in a six qubit Si/SiGe quantum processor to demonstrate, for the first time, state … control fidelities above 99%. The operation of the quantum processor is quantitatively characterized using gate …

Josephson Junction Materials Research Using Phase Qubits

May 30, 2006
Author(s)
Raymond Simmonds, Dustin P. Hite, Robert McDermott, Matthias Steffen, Ken B. Cooper, Kristine Lang, John M. Martinis, David P. Pappas
… Macroscopic Quantum Coherence and Computing … decoherence, Josephson tunnel junction, Materials research, Quantum computing … Quantum Computation: solid state systems …

Experimental demonstration of a receiver beating the standard quantum limit for multiple nonorthogonal coherent-state discrimination

January 6, 2013
Author(s)
Francisco E. Becerra Chavez, Jingyun Fan, Gerald Baumgartner, Julius Goldhar, Jonathan Kosloski, Alan L. Migdall
… The measurement of the state of a quantum system with inherent quantum uncertainty (noise) approaching the ultimate physical … limits is of both technological and fundamental interest. Quantum noise prevents any mutually nonorthogonal quantum … quantum mechanics, standard quantum limit, metrology, …

Quantum coding with low-depth random circuits

September 24, 2021
Author(s)
Michael Gullans, David A. Huse, Stefan Krastanov, Liang Jiang, Steven T. Flammia
… Random quantum circuits have played a central role in establishing the computational advantages of near-term quantum computers over their conventional counterparts. Here, … local connectivity in D ≥ 1 spatial dimensions to generate quantum error-correcting codes. For random stabilizer codes …

Quantum Estimation of the Classical Gravitational Field

November 6, 2017
Author(s)
Emanuel H. Knill, T. G. Downes, G. J. Milburn, C. M. Caves, J. R. van Meter
… Here we describe a quantum limit to measurement of the classical gravitational field. Specifically, we formulate the quantum Cramer-Rao lower bound for estimating the single … metrics. We employ the locally covariant formulation of quantum field theory in curved spacetime, which allows for a …

Designing Quantum Dots and Quantum-Dot Solids

October 1, 2001
Author(s)
Garnett W. Bryant, W Jaskolski
… spectra are obtained for CdS/HgS/CdS and ZnS/CdS/ZnS quantum-dot quantum-well barrier/well/barrier nanocrystals. Comparison … electronic structure, nanocrystal, optical absorption, quantum dot, semiconductor … Designing Quantum Dots and Quantum-Dot Solids …

Randomness in nonlocal games between mistrustful players

June 15, 2017
Author(s)
Carl A. Miller, Yaoyun Shi
… If two quantum players at a nonlocal game G achieve a superclassical … any third player. This is the basis for device-independent quantum cryptography. In this paper we address a related … Quantum Information & Computation … quantum information, cryptography, random number generation, …

Formation of Quantum-Dot Quantum-Well Heteronanostructures with Large Lattice Mismatch: ZnS/CdS/ZnS

January 1, 2001
Author(s)
R B. Little, M El-Sayed, Garnett W. Bryant, S Burke
… high quality II-VI superlattice structures can be made in quantum dots, despite the large bulk lattice-mismatch. Two … on them to produce high quality ZnS/CdS core/shell quantum dot quantum well heteronanostructures with extremely curved … absorbance, CdS, heteronanostructures, nanocrystals, quantum dot, quantum well, ZnS …

The Impossibility of Efficient Quantum Weak Coin-Flipping

June 22, 2020
Author(s)
Carl A. Miller
… carry out a fair coin flip, using only a noiseless quantum channel? This problem (quantum weak coin-flipping) was formalized more than 15 years … despite some phenomenal theoretical progress, practical quantum coin-flipping protocols with vanishing bias have … quantum cryptography, randomness, complex analysis …

Implementation of generalized quantum measurements for unambiguous discrimination of multiple nonorthogonal coherent states

June 18, 2013
Author(s)
Francisco E. Becerra Chavez, Jingyun Fan, Alan L. Migdall
… Generalized quantum measurements can perform perfect discrimination of … outcomes. We demonstrate the realization of generalized quantum measurements for unambiguous discrimination of four nonorthogonal coherent states and obtain its quantum mechanical description, its positive-operator valued …

Preface to Proceedings of the International Conference Quantum Theory: Reconsideration of Foundations-6 (QTRF6) held in Vaxjo, Sweden, 11-14 June 2012

December 18, 2012
Author(s)
Harald Atmanspacher, Andrei Khrennikov, Alan L. Migdall, Sergey Polyakov
… of topics was presented in talks at this conference: quantum foundations (especially, Heisenberg's uncertainty … and information, mathematical formalism of quantum theory, philosophy, methodology of measurements and … of new exciting experiments on testing foundations of quantum mechanics and quantum field theory. A number of talks …

Freezing of a Disorder Induced Spin Liquid with Strong Quantum Fluctuations

June 29, 2021
Author(s)
Xiao Hu, Daniel M. Pajerowski, Depei Zhang, Andrey Podlesnyak, Yiming Qiu, Qing Huang, Haidong Zhou, Israel Klich, Alexander I. Kolesnikov, M. B. Stone, Seung-Hun Lee
… that this system transits from a gapless disorder-induced quantum spin liquid to a new quantum state below T f = 1.7(1) K, exhibiting a weak frozen … for such a weak freezing in this highly fluctuating quantum regime. … quantum spin liquid, quantum spin jam, neutron scattering …

Hybrid quantum systems with trapped charged particles

February 21, 2017
Author(s)
Shlomi S. Kotler, Raymond Simmonds, Dietrich Leibfried, David J. Wineland
… Trapped charged particles have been at the forefront of quantum information processing (QIP) for a few decades now, … fidelity. In a hybrid system involving trapped charges, quantum degrees of freedom of macroscopic objects such as … of the charges. The hybrid system therefore implements a "quantum transducer," where the quantum reality (i.e., …

Quantum Blackbody Thermometry

April 22, 2021
Author(s)
Eric B. Norrgard, Stephen Eckel, Christopher L. Holloway, Eric L. Shirley
… blackbody radiation using ensembles of polarizable quantum systems, such as Rydberg atoms and diatomic molecules. Quantum measurements with these exquisite electric field … on blackbody standards. The successful merger of quantum and blackbody-based measurements provides a new, …

Quantum-enhanced interferometry with large heralded photon-number states

June 14, 2020
Author(s)
G Thekkadath, M.E. Mycroft, B.A. Bell, C.G. Wade, A. Eckstein, David Phillips, R.B Patel, A. Buraczewski, Adriana Lita, Thomas Gerrits, Sae Woo Nam, M. Stobinska, A.I. Lvovsky, Ian Walmsley
… Quantum phenomena such as entanglement can improve … detectors to perform interferometry with novel heralded quantum probes of sizes up to N = 8 (i.e. measuring up to … photon-number states into an interferometer, and provide quantum-enhanced phase sensitivity even in the presence of …

Quantum amplification of boson-mediated interactions

May 13, 2021
Author(s)
Shaun C. Burd, Raghavendra Srinivas, Hannah M. Knaack, Wenchao Ge, Andrew C. Wilson, David J. Wineland, Dietrich Leibfried, John J. Bollinger, David T. Allcock, Daniel Slichter
… Strong and precisely controlled interactions between quantum objects are essential for quantum information processing\citeSackett2000,Majer2007}, … and for the formation of exotic quantum matter\citeBloch2008}. A well-established paradigm … Squeezing, trapped ion, quantum information processing, entanglement …

Early observations of macroscopic quantum jumps in single atoms

March 25, 2015
Author(s)
Wayne M. Itano, James C. Bergquist, David J. Wineland
… atomic ion, a phenomenon better known as 'macroscopic quantum jumps,' was an important early scientific application … called 'electron shelving.' The existence of the quantum jumps was viewed with skepticism by some in the quantum optics community, perhaps due to the failure of some …

Quantifying the post-quantum security-margin of popular block ciphers

March 27, 2018
Author(s)
Yi-Kai Liu, Brittanney Amento-Adelmann, Markus Grassl, Brandon Langenberg, Eddie Schoute, Rainer Steinwandt
… requires the implementation of the target cipher on a quantum computer. We report quantum circuits and resource bounds for various block … Cryptography, quantum computing, block ciphers, quantum algorithms … Quantifying the post-quantum security-margin of popular block ciphers …

Quantum correlations in a noisy neutron interferometer

September 15, 2014
Author(s)
Michael G. Huber, Muhammad D. Arif, Christopher Wood, D G. Cory, M. O. Abutaleb, Dimitry A. Pushin
… We investigate quantum coherences in the presence of noise by entangling the … of the output state reduces to zero, however the quantum discord remains non-zero for all noise values. Hence … a neutron interferometer still exhibits uniquely quantum behaviour. … neutron interferometry, quantum coherence …
Displaying 201 - 225 of 3642
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