We propose a potentially practical scheme for efcient generation of entanglement with two nitrogen-vacancy centers(NVC)coupled to a whispering-gallery mode cavity.By virtue of the virtual-photon-excitation,the entangl...We propose a potentially practical scheme for efcient generation of entanglement with two nitrogen-vacancy centers(NVC)coupled to a whispering-gallery mode cavity.By virtue of the virtual-photon-excitation,the entanglement with two separate NVC can be produced in a deterministic way.The required operations are very close to the capabilities of current experimental techniques.The efects of decoherence induced by the cavity decay and the atomic spontaneous decay are also investigated.展开更多
We present an entanglement analysis protocol on entangled electron spins using quantum dot(QD)and microcavity coupled system.Each quantum dot is placed in the microcavity and ancilla photon input-output process could ...We present an entanglement analysis protocol on entangled electron spins using quantum dot(QD)and microcavity coupled system.Each quantum dot is placed in the microcavity and ancilla photon input-output process could be used to check the parity of the quantum dots.After the parity check process,the user only needs to measure the spin direction of the QD spin,and the state information can be readout completely.The feasibility of our scheme and the experimental challenge are discussed by considering currently available techniques.展开更多
It is shown that strong coupling of Bose-Einstein condensates to an optical cavity can be realized ex- perimentally. With an additional driven microwave field, we show that a highly nonlinear coupling among atoms in a...It is shown that strong coupling of Bose-Einstein condensates to an optical cavity can be realized ex- perimentally. With an additional driven microwave field, we show that a highly nonlinear coupling among atoms in a Bose-Einstein condensate can be induced with the assistance of the cavity mode. With such interaction we can investigate the generation of many body entangled states. In particularly, we show that multipartite entangled CHZ states can be obtained in such architecture with current available techniques.展开更多
We extend an optimal entanglement distillation of the triplet Greenberger–Horne–Zeilinger(GHZ) state via entanglement concentrating in the three-partite partially electron-spin-entangled systems. Two entanglement co...We extend an optimal entanglement distillation of the triplet Greenberger–Horne–Zeilinger(GHZ) state via entanglement concentrating in the three-partite partially electron-spin-entangled systems. Two entanglement concentration protocols are similarly designed in detail with the post-selection in quantum-dot(QD) and micro-cavity coupled systems. The proposed protocol can be repeated several rounds to achieve an optimal success probability with an assistance of the ancillary QD, where only the single photon needs to pass through the micro-cavity for each round. It increases the total success probability of the distillation even if the implemented cavity is imperfect in practice during the whole process.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.10874122 and 11372122)the Program for Excellent Talents at the University of Guangdong Province(Guangdong Teacher Letter[1010]No.79)
文摘We propose a potentially practical scheme for efcient generation of entanglement with two nitrogen-vacancy centers(NVC)coupled to a whispering-gallery mode cavity.By virtue of the virtual-photon-excitation,the entanglement with two separate NVC can be produced in a deterministic way.The required operations are very close to the capabilities of current experimental techniques.The efects of decoherence induced by the cavity decay and the atomic spontaneous decay are also investigated.
基金supported by the National Fundamental Research Program(Grant No.2010CB923202)the Specialized Research Fund for the Doctoral Program of Education Ministry of China(Grant No.20090005120008)the Fundamental Research Funds for the Central Universities,the National Natural Science Foundation of China(Grant Nos.61178010 and 61205117)
文摘We present an entanglement analysis protocol on entangled electron spins using quantum dot(QD)and microcavity coupled system.Each quantum dot is placed in the microcavity and ancilla photon input-output process could be used to check the parity of the quantum dots.After the parity check process,the user only needs to measure the spin direction of the QD spin,and the state information can be readout completely.The feasibility of our scheme and the experimental challenge are discussed by considering currently available techniques.
基金Supported by the National Fundamental Research Program of China under Grant No.2013CB921804the Program for Changjiang Scholars and Innovative Research Team in University under Grant No.IRT1243the Natural Science Foundation of Anhui Province under Grant No.1408085MA20
文摘It is shown that strong coupling of Bose-Einstein condensates to an optical cavity can be realized ex- perimentally. With an additional driven microwave field, we show that a highly nonlinear coupling among atoms in a Bose-Einstein condensate can be induced with the assistance of the cavity mode. With such interaction we can investigate the generation of many body entangled states. In particularly, we show that multipartite entangled CHZ states can be obtained in such architecture with current available techniques.
基金Supported by the National Natural Science Foundation of China under Grant No.61379153the New Century Excellent Talents in University,China(NCET-11-0510)+1 种基金partly by the Research Plan Projects of Science–Technology Department of Hunan Province under Grant No.2012TZ2017the Construct Program of the Key Discipline in Hunan Province
文摘We extend an optimal entanglement distillation of the triplet Greenberger–Horne–Zeilinger(GHZ) state via entanglement concentrating in the three-partite partially electron-spin-entangled systems. Two entanglement concentration protocols are similarly designed in detail with the post-selection in quantum-dot(QD) and micro-cavity coupled systems. The proposed protocol can be repeated several rounds to achieve an optimal success probability with an assistance of the ancillary QD, where only the single photon needs to pass through the micro-cavity for each round. It increases the total success probability of the distillation even if the implemented cavity is imperfect in practice during the whole process.
