Dynamical creation of entanglement by homodyne-mediated feedback

Details Dynamical creation of entanglement by homodyne-mediated feedback Dynamical creation of entanglement by homodyne-mediated feedback

2004-09-22

arxiv.org/abs/quant-ph/0409154v2

Published in Phys. Rev. A 71, 042309, (2005)

Physics

Quantum Physics

8 pages

Scientific paper

10.1103/PhysRevA.71.042309

For two two-level atoms coupled to a single-mode cavity field that is driven and heavily damped, the steady-state can be entangled by shining an un-modulated driving laser on the system [S.Schneider, G. J. Milburn Phys. Rev A 65, 042107, 2002]. We present a scheme to significantly increase the steady-state entanglement by using homodyne-mediated feedback, in which the driving laser is modulated by the homodyne photocurrent derived from the cavity output. Such feedback can increase the nonlinear response to both the decoherence process of the two-qubit system and the coherent evolution of individual qubits. We present the properties of the entangled states using the SO(3) Q function.

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