Entangling distant quantum dots using classical interference

Abstract

We show that it is possible to employ reservoir engineering to turn two distant and relatively bad cavities into one good cavity with a tunable spontaneous decay rate. As a result, quantum computing schemes, that would otherwise require the shuttling of atomic qubits in and out of an optical resonator, can now be applied to distant quantum dots. To illustrate this we transform a recent proposal to entangle two qubits via the observation of macroscopic fluorescence signals [Metz et al., Phys. Rev. Lett. 97, 040503 (2006)] to the electron-spin states of two semiconductor quantum dots. Our scheme requires neither the coherent control of qubit-qubit interactions nor the detection of single photons. Moreover, the scheme is relatively robust against spin-bath couplings, parameter fluctuations, and the spontaneous emission of photons.

5 pages, 5 figures, revised version, new title

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• Generating single-mode behavior in fiber-coupled optical cavities
• Protecting subspaces by acting on the outside
• Coherent quantum effects through dispersive bosonic media
• Modelling of quantum information processing with Ehrenfest guided tra jectories: a case study
• Parity measurement of remote qubits using dispersive coupling and photodetection
• High fidelity state mapping performed in a V-type level structure via stimulated Raman transition