Results 41 to 50 of about 1,674 (111)

Feedback control of quantum state reduction [PDF]

, 2004
Feedback control of quantum mechanical systems must take into account the probabilistic nature of quantum measurement. We formulate quantum feedback control as a problem of stochastic nonlinear control by considering separately a quantum filtering ...
Mabuchi, Hideo, Stockton, John K., van Handel, Ramon   +2 more
core   +4 more sources

Speed Meter As a Quantum Nondemolition Measuring Device for Force [PDF]

, 1996
Quantum noise is an important issue for advanced LIGO. Although it is in principle possible to beat the Standard Quantum Limit (SQL), no practical recipe has been found yet.
A. Abramovici, C. Bradaschia, F. Ya. Khalili, K. S. Thorne, M. T. Jaekel, S. P. Vyatchanin, S. P. Vyatchanin, V. B. Braginsky, V. B. Braginsky, V. B. Braginsky, Yu. Levin   +10 more
core   +2 more sources

Quantum bit detector

, 2004
We propose and analyze an experimental scheme of quantum nondemolition detection of monophotonic and vacuum states in a superconductive toroidal cavity by means of Rydberg atoms.Comment: 4 pages, 3 ...
B. T. H. Varcoe, D. Meschede, G. Walther, H. Walther, M. Brune, M. L. Gorodetsky, M. P. Klembovsky, P. Meystre, Th. Becker, V. B. Braginsky   +9 more
core   +1 more source

Quantum Nondemolition Charge Measurement of a Josephson Qubit

, 2005
In a qubit system, the measurement operator does not necessarily commute with the qubit Hamiltonian, so that the readout process demolishes (mixes) the qubit energy eigenstates. The readout time is therefore limited by such a mixing time and its fidelity
A. N. Korotkov, D. V. Averin, M. H. S. Amin, T. P. Orlando   +3 more
core   +1 more source

Polarization entanglement purification of nonlocal microwave photons based on the cross-Kerr effect in circuit QED

, 2017
Microwave photons have become very important qubits in quantum communication as the first quantum satellite has been launched successfully. Therefore, it is a necessary and meaningful task for ensuring the high security and efficiency of microwave-based ...
Alsaedi, Ahmed, Deng, Fu-Guo, Hayat, Tasawar, Liu, Qian, Xiong, Jun, Xu, Xu-Sheng, Zhang, Hao   +6 more
core   +1 more source

Quantum nondemolition measurements on coupled harmonic oscillators [PDF]

, 1983
Quantum nondemolition measurements on an harmonic-oscillator detector are discussed for two detector-meter coupling schemes: parametric amplification and parametric frequency conversion.
A. S. Lane, B. R. Mollow, B. R. Mollow, C. M. Caves, D. F. Walls, D. F. Walls, G. J. Milburn, H. P. Yuen, H. P. Yuen, J. Tucker, M. Hillery, P. D. Drummond, P. D. Drummond, V. B. Braginsky, V. B. Braginsky, W. G. Unruh, W. G. Unruh, W. H. Louisell   +17 more
core   +1 more source

Probing GHz Gravitational Waves with Graviton-magnon Resonance

, 2020
A novel method for extending frequency frontier in gravitational wave observations is proposed. It is shown that gravitational waves can excite a magnon.
Ikeda, Tomonori, Ito, Asuka, Miuchi, Kentaro, Soda, Jiro   +3 more
core   +1 more source

Method for universal detection of two-photon polarization entanglement

, 2015
Detecting and quantifying quantum entanglement of a given unknown state poses problems that are fundamentally important for quantum information processing.
Bartkiewicz, Karol, Horodecki, Paweł, Lemr, Karel, Miranowicz, Adam, Życzkowski, Karol   +4 more
core   +1 more source

Detecting the degree of macroscopic quantumness using an overlap measurement

, 2014
We investigate how to experimentally detect a recently proposed measure to quantify macroscopic quantum superpositions [Phys. Rev. Lett. 106, 220401 (2011)], namely, "macroscopic quantumness" $\mathcal{I}$.
Angelakis, Dimitris G., Bae, Seunglee, Jeong, Hyunseok, Noh, Changsuk, Ralph, Timothy C.   +4 more
core   +1 more source

Attacking quantum key distribution with single-photon two-qubit quantum logic

, 2005
The Fuchs-Peres-Brandt (FPB) probe realizes the most powerful individual attack on Bennett-Brassard 1984 quantum key distribution (BB84 QKD) by means of a single controlled-NOT (CNOT) gate.
Shapiro, Jeffrey H., Wong, Franco N. C.
core   +1 more source