Critical behavior in ultrastrong-coupled oscillatorsopen access
- Authors
- Sudhir, Vivishek; Genoni, Marco G.; Lee, Jinhyoung; Kim, M. S.
- Issue Date
- Jul-2012
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW A, v.86, no.1, pp.1 - 5
- Indexed
- SCIE
SCOPUS
- Journal Title
- PHYSICAL REVIEW A
- Volume
- 86
- Number
- 1
- Start Page
- 1
- End Page
- 5
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/144753
- DOI
- 10.1103/PhysRevA.86.012316
- ISSN
- 1050-2947
- Abstract
- We investigate the strong-coupling regime of a linear x-x coupled harmonic-oscillator system by performing a direct diagonalization of the Hamiltonian. It is shown that the x-x coupled Hamiltonian can be equivalently described by a Mach-Zehnder-type interferometer with a quadratic unitary operation in each of its arms. We show a sharp transition of the unitary operation from an elliptical phase rotator to an elliptical squeezer as the coupling gets stronger, leading to the continuous generation of entanglement, even for a significantly thermal state in the ultrastrong-coupled regime. It is also shown that this critical regime cannot be achieved by a classical Hookian coupling. Finally, the effect of a finite-temperature environment is analyzed, showing that entanglement can still be generated from a thermal state in the ultrastrong-coupled regime but is destroyed rapidly.
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