Measurement-based approach to entanglement generation in coupled quantum dots

Abstract

The remarkable phenomenon of measurement-induced quantum entanglement has recently been demonstrated between noninteracting atomic systems ͓D. L. Moehring et al., Nature ͑London͒ 449, 68 ͑2007͔͒. In the solid state, the technique may offer a new means of harnessing the strong interactions between neighboring units without the need for precise control over interactions. Recently, we proposed a method for optical parity measurements in a coupled quantum dot system ͓A. Kolli et al., Phys. Rev. Lett. 97, 250504 ͑2006͔͒. Here we perform a comprehensive analytic and numerical study to determine the feasibility of realizing this method using existing technology. We calculate the effects of possible error sources including nonideal photon detectors, ineffective spin-selective excitation, and dot distinguishability ͑both spatial and spectral͒. Furthermore, we present an experimental approach for verifying the success of the parity measurement. We conclude that experimental realization of the process should be feasible immediately.

One-step generation of Bell state on nonlocal acoustics wave resonators assisted by nitrogen-vacancy center ensembles

“…Over the past few decades, quantum entanglement [2][3][4][5][6][7][8] has been widely studied in the main branches of QIP, such as quantum teleportation [9][10][11][12], quantum dense coding [13][14][15], and quantum cryptography [16][17][18][19]. Meanwhile, many schemes of quantum entanglement generation have been proposed and demonstrated both theoretically and experimentally based on various quantum systems such as cavity quantum electrodynamics [20][21][22][23], quantum dots [24][25][26][27][28], nitrogen-vacancy (NV) centers [29][30][31][32][33], photons [34], optomechanical systems [35][36][37][38], nanomechanical * Author to whom any correspondence should be addressed. resonators [39][40][41][42] and acoustic wave resonators (AWRs) [5,43,44].…”

Symmetry and size effects on energy and entanglement of an exciton in coupled quantum dots

“…A system consisting of coupled quantum dots (CQDs) is called an artificial molecule. [1][2][3] CQDs are interesting because they lead to the appearance of additional spectral lines. Moreover, they are very useful because of their potential applications not only in quantum device design, but also in the currently active field of quantum information processing.…”