Entangling distant quantum dots using classical interference

Details Entangling distant quantum dots using classical interference Entangling distant quantum dots using classical interference

2008-01-07

arxiv.org/abs/0801.0942v2

Phys. Rev. A 78, 040301(R) (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 5 figures, revised version, new title

Scientific paper

10.1103/PhysRevA.78.040301

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.

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