Data di Pubblicazione:
2012
Citazione:
Critical behavior in ultrastrong-coupled oscillators / V. Sudhir, M.G. Genoni, J. Lee, M..S. Kim. - In: PHYSICAL REVIEW A. - ISSN 1050-2947. - 86:1(2012 Jul), pp. 012316.1-012316.5.
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.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
atomic and molecular physics; optics
Elenco autori:
V. Sudhir, M.G. Genoni, J. Lee, M..S. Kim
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