Results 11 to 20 of about 1,674 (111)

Quantum nondemolition measurements via quantum counting [PDF]

Physical Review A, 1983
For a harmonic-oscillator gravitational-wave detector, we show that a quantum nondemolition measurement of the square of the number operator may be made by coupling the detector to an oscillator readout via a quadratic interaction, as in optical four ...
C. M. Caves, C. M. Caves, D. F. Walls, E. G. Beltrametti, G. J. Milburn, G. J. Milburn, M. Hillery, N. Bloembergen, V. B. Braginsky, W. G. Unruh, W. G. Unruh   +10 more
core   +3 more sources

Generalized Rotating‐Wave Approximation for the Quantum Rabi Model with Optomechanical Interaction

Annalen der Physik, Volume 535, Issue 11, November 2023., 2023
The generalized rotating‐wave approximation (G‐RWA) to calculate the energy spectrum of the quantum Rabi model with optomechanical interaction for arbitrary large couplings is implemented. The system behaves as atom‐cavity polaritons interacting with displaced phonons, leading to spectra in very good agreement with numerical results.
Wallace H. Montaño, Jesús A. Maytorena
wiley   +1 more source

Memoryless Quantum Repeaters Based on Cavity‐QED and Coherent States

Advanced Quantum Technologies, Volume 6, Issue 8, August 2023., 2023
A quantum repeater scheme based on cavity quantum electrodynamics and quantum error correction of channel loss via rotation‐symmetric bosonic codes is proposed to distribute atomic entangled states over long distances without memories and at high clock rates.
Pei‐Zhe Li, Peter van Loock
wiley   +1 more source

Statistical Methods for Quantum State Verification and Fidelity Estimation

Advanced Quantum Technologies, Volume 5, Issue 5, May 2022., 2022
How can one verify that a certain quantum state has been prepared in a quantum device? This question is essential for various tasks in quantum information processing. This article presents a pedagogical review on this topic. Starting from the theory of hypothesis testing, the current protocols for quantum state verification and fidelity estimation are ...
Xiao‐Dong Yu, Jiangwei Shang, Otfried Gühne   +2 more
wiley   +1 more source

The Information‐Complete Quantum Theory

Quantum Engineering, Volume 2022, Issue 1, 2022., 2022
Quantum mechanics is a cornerstone of our current understanding of nature and extremely successful in describing physics covering a huge range of scales. However, its interpretation remains controversial since the early days of quantum mechanics. What does a quantum state really mean?
Zeng-Bing Chen, ShiJie Wei
wiley   +1 more source

Donor Spins in Silicon for Quantum Technologies

Advanced Quantum Technologies, Volume 3, Issue 11, November 2020., 2020
Donor atoms in silicon are among the most coherent quantum systems in the solid state, and can be integrated with industry‐standard manufacturing methods. This review and perspective article describes applications of single donors in quantum computing, sensing and chaos, and donor ensembles for quantum memories.
Andrea Morello, Jarryd J. Pla, Patrice Bertet, David N. Jamieson   +3 more
wiley   +1 more source

Soliton back-action evading measurement using spectral filtering [PDF]

, 2002
We report on a back-action evading (BAE) measurement of the photon number of fiber optical solitons operating in the quantum regime. We employ a novel detection scheme based on spectral filtering of colliding optical solitons. The measurements of the BAE
A. La Porta, A. Mecozzi, A. Sizmann, B. Buchler, B.C. Buchler, C. Silberhorn, D. Levandovsky, E. Schmidt, F. König, F. König, G. Leuchs, H.A. Haus, J.-F. Roch, J.A. Levenson, J.M. Courty, J.P. Poizat, J.P. Poizat, K. Bencheikh, L.F. Mollenauer, M. Rosenbluh, M.D. Levenson, M.J. Holland, M.J. Werner, N. Imoto, P. Grangier, P. Grangier, P.D. Drummond, P.H. Souto Ribeiro, R. Bruckmeier, R. Bruckmeier, S. Chi, S. Schiller, S. Spälter, S. Spälter, S.F. Pereira, S.R. Friberg, S.R. Friberg, S.R. Friberg, T. Rechtenwald, V.B. Braginsky, V.V. Kozlov, W.H. Loh   +41 more
core   +2 more sources

Implementing and Characterizing Precise Multiqubit Measurements

Physical Review X, 2016
There are two general requirements to harness the computational power of quantum mechanics: the ability to manipulate the evolution of an isolated system and the ability to faithfully extract information from it.
J. Z. Blumoff, K. Chou, C. Shen, M. Reagor, C. Axline, R. T. Brierley, M. P. Silveri, C. Wang, B. Vlastakis, S. E. Nigg, L. Frunzio, M. H. Devoret, L. Jiang, S. M. Girvin, R. J. Schoelkopf   +14 more
doaj   +1 more source

A Quantum Rosetta Stone for Interferometry [PDF]

, 2002
Heisenberg-limited measurement protocols can be used to gain an increase in measurement precision over classical protocols. Such measurements can be implemented using, e.g., optical Mach-Zehnder interferometers and Ramsey spectroscopes.
Champollion J. F., Feynman R. P., Helstrom C. W., Hwang Lee, Jonathan P. Dowling, Kimble H. J., Kok P., Kok P., Kok P., Lee H., Pieter Kok, Scully M. O.   +11 more
core   +3 more sources

Probabilistically cloning two single-photon states using weak cross-Kerr nonlinearities

New Journal of Physics, 2014
By using quantum nondemolition detectors (QNDs) based on weak cross-Kerr nonlinearities, we propose an experimental scheme for achieving $1\to 2$ probabilistic quantum cloning (PQC) of a single-photon state, secretly choosing from a two-state set. In our
Wen Zhang, Pinshu Rui, Ziyun Zhang, Qun Yang   +3 more
doaj   +1 more source