We compare effects of decoherence and detection inefficiency on entangled coherent states (ECSs) and entangled photon pairs (EPPs), both of which are known to be particularly useful for quantum-information processing (QIP). When decoherence effects caused by photon losses are heavy, the ECSs outperform the EPPs as quantum channels for teleportation both in fidelities and in success probabilities. On the other hand, when inefficient detectors are used, the teleportation scheme using the ECSs suffers undetected errors that result in the degradation of fidelity, while this is not the case for the teleportation scheme using the EPPs. Our study reveals the merits and demerits of the two types of entangled states in realizing practical QIP under realistic conditions.We compare effects of decoherence and detection inefficiency on entangled coherent states (ECSs) and entangled photon pairs (EPPs), both of which are known to be particularly useful for quantum-information processing (QIP). When decoherence effects caused by photon losses are heavy, the ECSs outperform the EPPs as quantum channels for teleportation both in fidelities and in success probabilities. On the other hand, when inefficient detectors are used, the teleportation scheme using the ECSs suffers undetected errors that result in the degradation of fidelity, while this is not the case for the teleportation scheme using the EPPs. Our study reveals the merits and demerits of the two types of entangled states in realizing practical QIP under realistic conditions.

arXiv:1007.1279Physical Review ADec 27, 201034 citations

Entanglement in Quantum Information Processing

Samuel L. Braunstein

NATO science series. Series II, Mathematics, physics and chemistryJan 1, 20051 citation

Entangled coherent states versus entangled photon pairs for quantum information processing under photon loss effects

Ki-min Park B, Hyunseok Jeong, Timothy C. Ralph +1 more

We compare entangled coherent states (ECSs) and entangled photon pairs (EPPs) for quantum information processing (QIP) under effects of decoherence and detection inefficiency. When they are used as quantum channels for the standard teleportation protocol, the ECS shows larger fidelity than the EPP under strong decoherence. On the other hand, detection inefficiency causes the teleportation scheme using the ECS to suffer unlocated errors that results in the degradation of fidelity, while this is not the case with the EPP. Our study reveals the merits and demerits of the two types of entangled states in implementing QIP under realistic conditions.We compare entangled coherent states (ECSs) and entangled photon pairs (EPPs) for quantum information processing (QIP) under effects of decoherence and detection inefficiency. When they are used as quantum channels for the standard teleportation protocol, the ECS shows larger fidelity than the EPP under strong decoherence. On the other hand, detection inefficiency causes the teleportation scheme using the ECS to suffer unlocated errors that results in the degradation of fidelity, while this is not the case with the EPP. Our study reveals the merits and demerits of the two types of entangled states in implementing QIP under realistic conditions.

AIP conference proceedingsJan 1, 20110 citations

Generation of Entangled Coherent States

Yong Wook Cheong, Jinhyoung Lee

Journal of the Korean Physical SocietyOct 15, 20074 citations

Mixed Entangled Coherent Channel for Quantum Information Processing

Hyunseok Jeong, M. S. Kim, Jin-Hyoung Lee

We study an entangled two-mode coherent state within the framework of $2\\times 2$ dimensional Hilbert space and suggest a scheme to teleport a coherent superposition state. When the entangled coherent state decays into the vacuum, it is found that its evolved state always remains entangled and the larger the coherent amplitude, the faster entanglement decreases. We find that the decohered entangled coherent state can be useless in quantum teleportation as it gives the optimal fidelity of teleportation less than the classical limit 2/3.We study an entangled two-mode coherent state within the framework of $2\\times 2$ dimensional Hilbert space and suggest a scheme to teleport a coherent superposition state. When the entangled coherent state decays into the vacuum, it is found that its evolved state always remains entangled and the larger the coherent amplitude, the faster entanglement decreases. We find that the decohered entangled coherent state can be useless in quantum teleportation as it gives the optimal fidelity of teleportation less than the classical limit 2/3.

Apr 18, 20010 citations

We study an entangled two-mode coherent state within the framework of

2\\times 2

dimensional Hilbert space and suggest a scheme to teleport a coherent superposition state. When the entangled coherent state decays into the vacuum, it is found that its evolved state always remains entangled and the larger the coherent amplitude, the faster entanglement decreases. We find that the decohered entangled coherent state can be useless in quantum teleportation as it gives the optimal fidelity of teleportation less than the classical limit 2/3.