arXivDaily arXiv每日学术速递 周一至周五更新
arXiv quant-ph/0303007quant-ph
收藏

双量子比特混合态的最优隐形传态

Optimal teleportation with a mixed state of two qubits

F. Verstraete, H. Verschelde

摘要:

我们考虑两个量子比特的混合状态的单个副本,并推导出经典通信(LOCC)辅助下的最佳保迹局部操作,以最大化这种状态可以实现的隐形传态的保真度。这些最优的局域操作可以通过单向通信来实现,并且如果原始态是纠缠的,则总是产生大于2/3的隐形传态保真度。这个最大可达到的保真度是一个纠缠度量,并量化了破坏量子态中纠缠所需的最小混合量。

英文摘要:

We consider a single copy of a mixed state of two qubits and derive the optimal trace-preserving local operations assisted by classical communication (LOCC) such as to maximize the fidelity of teleportation that can be achieved with this state. These optimal local operations turn out to be implementable by one-way communication, and always yields a teleportation fidelity larger than 2/3 if the original state is entangled. This maximal achievable fidelity is an entanglement measure and turns out to quantify the minimal amount of mixing required to destroy the entanglement in a quantum state.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑