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Physics

Quantum information science

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Displaying 451 - 475 of 1693

Quantum interference enables constant-time quantum information processing

July 19, 2019
Author(s)
Thomas Gerrits, Sae Woo Nam, Adriana E. Lita, M. Stobinska, A. Buraczewski, M. Moore, W.R. Clements, J.J. Renema, W.S. Kolthammer, A. Eckstein, I.A. Walmsley
It is an open question how fast information processing can be performed and whether quantum effects can speed up the best existing solutions. Signal extraction, analysis, and compression in diagnostics, astronomy, chemistry, and broadcasting build on the

Active protection of a superconducting qubit with an interferometric Josephson isolator

July 17, 2019
Author(s)
Baleegh Abdo, Nicholas T. Bronn, Oblesh Jinka, Salvatore B. Olivadese, Antonio D. Corcoles, Vivekananda P. Adiga, Markus Brink, Russell Lake, Xian Wu, David P. Pappas, Jerry M. Chow
Nonreciprocal microwave devices play critical roles in high-fidelity, quantum-nondemolition (QND) measurement schemes. They impose unidirectional routing of readout signals and protect the quantum systems from unwanted noise originated by the output chain

Quantum gate teleportation between separated zones of a trapped-ion processor

May 31, 2019
Author(s)
Yong Wan, Daniel Kienzler, Stephen D. Erickson, Karl H. Mayer, Ting R. Tan, Jenny J. Wu, Hilma H. Macedo De Vasconcelos, Scott C. Glancy, Emanuel H. Knill, David J. Wineland, Andrew C. Wilson, Dietrich G. Leibfried
Large-scale quantum computers will inevitably require quantum gate operations between widely separated qubits, even within a single quantum information processing device. Nearly two decades ago, Gottesman and Chuang proposed a method for implementing such

Graphical Methods in Device-Independent Quantum Cryptography

May 27, 2019
Author(s)
Spencer J. Breiner, Carl A. Miller, Neil J. Ross
We introduce a framework for providing graphical security proofs for quantum cryptography using the methods of categorical quantum mechanics. We are optimistic that this approach will make some of the highly complex proofs in quantum cryptography more

Quantum Frequency Conversion of a Quantum Dot Single-Photon Source on a Nanophotonic Chip

May 20, 2019
Author(s)
Anshuman Singh, Qing Li, Shunfa Liu, Ying Yu, Xiyuan Lu, Christian Schneider, Sven Hofling, John Lawall, Varun Verma, Richard Mirin, Sae Woo Nam, Jin Liu, Kartik Srinivasan
Single self-assembled InAs/GaAs quantum dots are promising bright sources of indistinguishable photons for quantum information science. However, their distribution in emission wavelength, due to inhomogeneous broadening inherent to their growth, has

Electromagnetically induced transparency in inhomogeneously broadened solid media

May 15, 2019
Author(s)
Kumel H. Kagalwala, Fan Haoquan, Sergey Polyakov, Alan L. Migdall, Elizabeth A. Goldschmidt
We study, theoretically and experimentally, electromagnetically induced transparency (EIT) in two di erent solid-state systems. Unlike many implementations in homogeneously broadened media, these systems exhibit inhomogeneous broadening of their optical

A Testbed for Quantum Communication and Quantum Networks

May 13, 2019
Author(s)
Lijun Ma, Abdella Battou, Xiao Tang, Oliver T. Slattery
The development of Quantum Networks is underway with significant acceleration in in recent years. Meanwhile. quantum scale devices and components such as single photon sources, detectors, memories and interfaces are ever readier to leave the laboratory

Design and performance study of actively holding-off GHz-gated InGaAs/InP SPADs

May 13, 2019
Author(s)
Alessandro Restelli, Joshua C. Bienfang, Alan L. Migdall
High-speed periodic gating of InGaAs/InP single-photon avalanche diodes (SPADs) has allowed these detectors to operate at count rates above $10^8$ per second with low-afterpulsing. However, a drawback of high-speed periodic gating is that bias gates are

Generating polarization-entangled photon pairs in domain-engineered PPLN

May 7, 2019
Author(s)
Paulina S. Kuo, Varun B. Verma, Thomas Gerrits, Sae Woo Nam, Richard P. Mirin
Using a periodically poled LiNbO3 crystal that is domain-engineered for two simultaneous type-II down-conversion processes, we demonstrated polarization-entangled photon-pair generation.

Integrated transition edge sensors on lithium niobate waveguides

May 7, 2019
Author(s)
Thomas Gerrits, Adriana Lita, Richard Mirin, Sae Woo Nam, Jan P. Hoepker, Stephan Krapick, Harald Herrmann, Raimund Ricken, Victor Quiring, Christine Silberhorn, Tim J. Bartley
We show the proof-of-principle detection of light at 1550 nm coupled evanescently from a lithium niobate waveguide to a superconducting transition edge sensor. The coupling efficiency strongly depends on the polarization, the overlap between the evanescent

A solid-state source of strongly entangled photon pairs with high brightness and indistinguishability

April 22, 2019
Author(s)
Jin Liu, Rongbin Su, Yuming Wei, Beimeng Yao, Saimon Filipe Covre da Silva, Ying Yu, Jake Iles-Smith, Kartik Srinivasan, Armando Rastelli, Juntao Li, Xuehua Wang
The generation of high-quality entangled photon pairs has been being a long-sought goal in modern quan-tum communication and computation. To date, the most widely-used entangled photon pairs are gener-ated from spontaneous parametric downconversion, a
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