Decoherence induced spontaneous symmetry breaking

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Karpat, Göktuğ and Gedik, Zafer (2009) Decoherence induced spontaneous symmetry breaking. Optics Communications, 282 (22). pp. 4460-4463. ISSN 0030-4018

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Official URL: http://dx.doi.org/10.1016/j.optcom.2009.07.066


We study time dependence of exchange symmetry properties of Bell states when two-qubits interact with local baths having identical parameters. In case of classical noise, we consider a decoherence Hamiltonian which is invariant under swapping the first and second qubits. We find that as the system evolves in time, two of the three symmetric Bell states preserve their qubit exchange symmetry with unit probability, whereas the symmetry of the remaining state survives with a maximum probability of 0.5 at the asymptotic limit. Next, we examine the exchange symmetry properties of the same states under local, quantum mechanical noise which is modeled by two identical spin baths. Results turn out to be very similar to the classical case. We identify decoherence as the main mechanism leading to breaking of qubit exchange symmetry.

Item Type:Article
Uncontrolled Keywords:Quantum decoherence; Spontaneous symmetry breaking
Subjects:Q Science > QC Physics > QC170 Atomic physics. Quantum theory.
Q Science > QC Physics > QC1 General
ID Code:12077
Deposited By:Zafer Gedik
Deposited On:01 Oct 2009 15:00
Last Modified:23 Jul 2019 10:54

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