Results 21 to 30 of about 8,735 (248)
Interaction and quantum decoherence [PDF]
Physica B: Condensed Matter, 1998 We discuss a fundamental effect of the interaction-induced decoherence of the electron wave function in disordered metals. In the first part of the paper we consider a simple model of a quantum particle interacting with a bath of harmonic oscillators and analyze the physical origin of the effect.
Golubev, D. S., Zaikin, Andrei D.
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Decoherence in quantum mechanics [PDF]
Annals of Physics, 2011 We study decoherence in a simple quantum mechanical model using two approaches. Firstly, we follow the conventional approach to decoherence where one is interested in solving the reduced density matrix from the perturbative master equation. Secondly, we consider our novel correlator approach to decoherence where entropy is generated by neglecting ...
Koksma, J.F. +2 more
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Squeezing of Primordial Gravitational Waves as Quantum Discord
Universe, 2020 We investigate the squeezing of primordial gravitational waves (PGWs) in terms of quantum discord. We construct a classical state of PGWs without quantum discord and compare it with the Bunch−Davies vacuum.
Akira Matsumura, Yasusada Nambu
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Optimal teleportation via noisy quantum channels without additional qubit resources
npj Quantum Information, 2021 Quantum teleportation exemplifies how the transmission of quantum information starkly differs from that of classical information and serves as a key protocol for quantum communication and quantum computing.
Dong-Gil Im +6 more
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Quantum Erasure of Decoherence [PDF]
Open Systems & Information Dynamics, 2007 We consider the classical algebra of observables that are diagonal in a given orthonormal basis, and define a complete decoherence process as a completely positive map that asymptotically converts any quantum observable into a diagonal one, while preserving the elements of the classical algebra.
BUSCEMI, FRANCESCO +2 more
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QUANTUM DISCORD, DECOHERENCE AND QUANTUM PHASE TRANSITION [PDF]
International Journal of Modern Physics B, 2012 Quantum discord is a more general measure of quantum correlations than entanglement and has been proposed as a resource in certain quantum information processing tasks. The computation of discord is mostly confined to two-qubit systems for which an analytical calculational scheme is available.
Bose, Indrani, Pal, Amit Kumar
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Frictional quantum decoherence [PDF]
Journal of Physics A: Mathematical and Theoretical, 2007 The dynamics associated with a measurement-based master equation for quantum Brownian motion are investigated. A scheme for obtaining time evolution from general initial conditions is derived. This is applied to analyze dissipation and decoherence in the evolution of both a Gaussian and a Schr dinger cat initial state.
Bellomo, Bruno +2 more
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Identification of Time-Varying Decoherence Rates for Open Quantum Systems
IEEE Transactions on Quantum Engineering, 2021 Parameter identification of quantum systems is a fundamental task in developing practical quantum technology. In this article, we study the identification of time-varying decoherence rates for open quantum systems.
Shuixin Xiao +3 more
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Decoherence-Induced Sudden Death of Entanglement and Bell Nonlocality
Photonics, 2022 Decoherence due to the unwanted interaction between a quantum system and environment leads to the degradation of quantum coherence. In particular, for an entangled state, decoherence makes a loss of entanglement and Bell nonlocality known as entanglement
Dong-Gil Im, Yoon-Ho Kim
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Killing horizons decohere quantum superpositions
Physical Review D, 2023 16 pages, 1 figure. Accepted for publication in Phys. Rev. D. v2: Added clarifying remarks and a figure, and pointed out that the effect arises for any d>=4; corrected equation (3.18)
Daine L. Danielson +2 more
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