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, which 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 [J. Metz , Phys. Rev. Lett. 97, 040503 (2006)] to the electronspin states of two semiconductor quantum dots. Our scheme requires neither the coherent control of qubitqubit interactions nor the detection of single photons. Moreover, the scheme is relatively robust against spinbath couplings, parameter fluctuations, and the spontaneous emission of photons.
 Publication:

Physical Review A
 Pub Date:
 October 2008
 DOI:
 10.1103/PhysRevA.78.040301
 arXiv:
 arXiv:0801.0942
 Bibcode:
 2008PhRvA..78d0301B
 Keywords:

 03.67.Lx;
 03.67.Pp;
 73.21.La;
 Quantum computation;
 Quantum error correction and other methods for protection against decoherence;
 Quantum dots;
 Condensed Matter  Mesoscale and Nanoscale Physics;
 Quantum Physics
 EPrint:
 5 pages, 5 figures, revised version, new title