Entangling distant quantum dots using classical interference

TL;DR

This paper demonstrates a reservoir engineering approach to entangle distant quantum dots by transforming two poor cavities into a single effective cavity, enabling quantum computing without complex control or single-photon detection.

Contribution

It introduces a novel method to entangle distant quantum dots using classical interference and reservoir engineering, avoiding the need for coherent control and single-photon detection.

Findings

Transforming two bad cavities into a good one with tunable decay rate

Entangling quantum dots without single-photon detection

Robustness against decoherence and parameter fluctuations

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.