Decoherence induced spontaneous symmetry breaking

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

[thumbnail of OPTICS14399.pdf] PDF

Download (309kB)


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
Divisions: Faculty of Engineering and Natural Sciences > Basic Sciences > Physics
Faculty of Engineering and Natural Sciences
Depositing User: Zafer Gedik
Date Deposited: 01 Oct 2009 15:00
Last Modified: 26 Apr 2022 08:29

Actions (login required)

View Item
View Item