TY - JOUR
T1 - Generation and entanglement concentration for electron-spin entangled cluster states using charged quantum dots in optical microcavities
AU - Zhao, Jie
AU - Zheng, Chun Hong
AU - Shi, Peng
AU - Ren, Chun Nian
AU - Gu, Yong Jian
PY - 2014/7/1
Y1 - 2014/7/1
N2 - We present schemes for deterministically generating multi-qubit electron-spin entangled cluster states by the giant circular birefringence, induced by the interface between the spin of a photon and the spin of an electron confined in a quantum dot embedded in a double-sided microcavity. Based on this interface, we construct the controlled phase flip (CPF) gate deterministically which is performed on electron-spin qubits and is the essential component of the cluster-state generation. As one of the universal gates, the CPF gate constructed can also be utilized in achieving scalable quantum computing. Besides, we propose the entanglement concentration protocol to reconstruct a partially entangled cluster state into a maximally entangled one, resorting to the projection measurement on an ancillary photon. By iterating the concentration scheme several times, the maximum success probability can be achieved. The fidelities and experimental feasibilities are analyzed with respect to currently available techniques, indicating that our schemes can work well in both the strong and weak (Purcell) coupling regimes.
AB - We present schemes for deterministically generating multi-qubit electron-spin entangled cluster states by the giant circular birefringence, induced by the interface between the spin of a photon and the spin of an electron confined in a quantum dot embedded in a double-sided microcavity. Based on this interface, we construct the controlled phase flip (CPF) gate deterministically which is performed on electron-spin qubits and is the essential component of the cluster-state generation. As one of the universal gates, the CPF gate constructed can also be utilized in achieving scalable quantum computing. Besides, we propose the entanglement concentration protocol to reconstruct a partially entangled cluster state into a maximally entangled one, resorting to the projection measurement on an ancillary photon. By iterating the concentration scheme several times, the maximum success probability can be achieved. The fidelities and experimental feasibilities are analyzed with respect to currently available techniques, indicating that our schemes can work well in both the strong and weak (Purcell) coupling regimes.
KW - Cluster state
KW - Entanglement concentration
KW - Quantum dot inside microcavities
UR - http://www.scopus.com/inward/record.url?scp=84894682823&partnerID=8YFLogxK
U2 - 10.1016/j.optcom.2014.02.019
DO - 10.1016/j.optcom.2014.02.019
M3 - Comment/debate
AN - SCOPUS:84894682823
SN - 0030-4018
VL - 322
SP - 32
EP - 39
JO - Optics Communications
JF - Optics Communications
ER -