Dynamical creation of entanglement by homodyne-mediated feedback
نویسندگان
چکیده
Jin Wang, 2 H. M. Wiseman, and G. J. Milburn Department of Physics and Astronomy, The University of Nebraska, Lincoln, Nebraska 68588-0111,USA Centre for Quantum Computer Technology, The University of Queensland, Brisbane, Queensland 4072, Australia Centre for Quantum Computer Technology, Centre for Quantum Dynamics, School of Science, Griffith University, Brisbane, Queensland 4111, Australia (Dated: 1st July 2004)
منابع مشابه
Procrustean Entanglement Concentration of Continuous Variable States of Light
We propose a Procrustean entanglement concentration scheme for continuous variable states inspired by the scheme proposed in [1]. We show that the eight-port homodyne measurement of [1] can be replaced by a balanced homodyne measurement with the advantage of providing a success criterion that allows Alice and Bob to determine if entanglement concentration was achieved. In addition, it facilitat...
متن کاملCreating and detecting micro-macro photon-number entanglement by amplifying and deamplifying a single-photon entangled state.
We propose a scheme for the observation of micro-macro entanglement in photon number based on amplifying and deamplifying a single-photon entangled state in combination with homodyne quantum state tomography. The created micro-macro entangled state, which exists between the amplification and deamplification steps, is a superposition of two components with mean photon numbers that differ by appr...
متن کاملnt - p h / 06 05 14 3 v 3 8 Se p 20 06 Procrustean entanglement concentration of continuous variable states of light
We propose a Procrustean entanglement concentration scheme for continuous variable states inspired by the scheme proposed in [J. Fiuràšek et. al., Phys. Rev. A 67, 022304 (2003)]. We show that the eight-port homodyne measurement of [J. Fiuràšek et. al., Phys. Rev. A 67, 022304 (2003)] can be replaced by a balanced homodyne measurement with the advantage of providing a success criterion that all...
متن کاملOptimal control of entanglement via quantum feedback
It has recently been shown that finding the optimal measurement on the environment for stationary Linear Quadratic Gaussian control problems is a semi-definite program. We apply this technique to the control of the EPR-correlations between two bosonic modes interacting via a parametric Hamiltonian at steady state. The optimal measurement turns out to be nonlocal homodyne measurement — the outpu...
متن کاملQuantum control of atomic systems by homodyne detection and feedback
We investigate the possibilities of preserving and manipulating the coherence of atomic two-level systems by ideal projective homodyne detection and feedback. For this purpose, the photon emission process is described on time scales much shorter than the lifetime of the excited state using a model based on WignerWeisskopf theory. The backaction of this emission process is analytically described...
متن کامل