Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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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 -