TY - JOUR

T1 - Coherence of an entangled exciton-photon state

AU - Hudson, A. J.

AU - Stevenson, R. M.

AU - Bennett, A. J.

AU - Young, R. J.

AU - Nicoll, C. A.

AU - Atkinson, P.

AU - Cooper, K.

AU - Ritchie, D. A.

AU - Shields, A. J.

PY - 2007/12/31

Y1 - 2007/12/31

N2 - We study the effect of the exciton fine-structure splitting on the polarization entanglement of photon pairs produced by the biexciton cascade in a quantum dot. Entanglement persists despite separations between the intermediate energy levels of up to 4 mu eV. Measurements show that entanglement of the photon pair is robust to the dephasing of the intermediate exciton state responsible for the first-order coherence time of either single photon. We present a theoretical framework incorporating the effects of spin scattering, background light, and dephasing. We distinguish between the first-order coherence time, and a parameter which we measure for the first time and define as the cross-coherence time.

AB - We study the effect of the exciton fine-structure splitting on the polarization entanglement of photon pairs produced by the biexciton cascade in a quantum dot. Entanglement persists despite separations between the intermediate energy levels of up to 4 mu eV. Measurements show that entanglement of the photon pair is robust to the dephasing of the intermediate exciton state responsible for the first-order coherence time of either single photon. We present a theoretical framework incorporating the effects of spin scattering, background light, and dephasing. We distinguish between the first-order coherence time, and a parameter which we measure for the first time and define as the cross-coherence time.

U2 - 10.1103/PhysRevLett.99.266802

DO - 10.1103/PhysRevLett.99.266802

M3 - Journal article

VL - 99

SP - -

JO - Physical review letters

JF - Physical review letters

SN - 0031-9007

IS - 26

M1 - 266802

ER -