Dynamical creation of entanglement by homodyne-mediated feedback

Wang, J., Wiseman, H. M. and Milburn, G. J. (2005) Dynamical creation of entanglement by homodyne-mediated feedback. Physical Review A, 71 4: 042309. doi:10.1103/PhysRevA.71.042309

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Author Wang, J.
Wiseman, H. M.
Milburn, G. J.
Title Dynamical creation of entanglement by homodyne-mediated feedback
Journal name Physical Review A   Check publisher's open access policy
ISSN 1050-2947
Publication date 2005-01-01
Sub-type Article (original research)
DOI 10.1103/PhysRevA.71.042309
Open Access Status File (Publisher version)
Volume 71
Issue 4
Start page 042309
Total pages 9
Editor B. Crasemann
Place of publication College Pk
Publisher American Physical Society
Language eng
Subject C1
240300 Atomic and Molecular Physics; Nuclear and Particle Physics; Plasma Physics
780102 Physical sciences
Abstract For two two-level atoms coupled to a single Bosonic mode that is driven and heavily damped, the steady state can be entangled by resonantly driving the system [S. Schneider and 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 Bosonic mode is that of an electromagnetic cavity, the output of which is measured and the resulting homodyne photocurrent is used to modulate the field driving the qubits. 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.
Keyword Optics
Physics, Atomic, Molecular & Chemical
Quantum Key Distribution
Q-Index Code C1

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Created: Wed, 15 Aug 2007, 15:28:21 EST