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arXiv quant-ph/0612172quant-ph
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利用非高斯态改善从连续变量系统到定域量子比特的纠缠转移

Improving the entanglement transfer from continuous variable systems to localized qubits using non Gaussian states

Federico Casagrande, Alfredo Lulli, Matteo G. A. Paris

摘要:

我们研究了从一个二分连续变量(CV)系统到一对局域量子比特的纠缠转移,假设每个CV模通过非共振Jaynes-Cummings相互作用耦合到一个量子比特,两个子系统的相互作用时间不同.首先,我们考虑的情况下,CV系统准备在一个钟状叠加和调查的最大纠缠转移的条件。然后,我们分析了一般情况下的双模CV状态,可以表示为施密特分解的Fock数的基础上。这类包括高斯和非高斯CV状态,例如分别为双光束(TWB)和对相干(TMC,也称为双模相干)状态。在共振条件下,两个量子比特的相互作用时间相等以及不同的初始制备条件下,我们发现TMC态的纠缠转移比TWB态的纠缠转移更有效。从腔量子电动力学和超导量子比特等应用的角度出发,详细分析了非共振相互作用(失谐)和不同作用时间对两个量子比特纠缠转移的影响,并讨论了保持纠缠转移的条件。

英文摘要:

We investigate the entanglement transfer from a bipartite continuous-variable (CV) system to a pair of localized qubits assuming that each CV mode couples to one qubit via the off-resonance Jaynes-Cummings interaction with different interaction times for the two subsystems. First, we consider the case of the CV system prepared in a Bell-like superposition and investigate the conditions for maximum entanglement transfer. Then we analyze the general case of two-mode CV states that can be represented by a Schmidt decomposition in the Fock number basis. This class includes both Gaussian and non Gaussian CV states, as for example twin-beam (TWB) and pair-coherent (TMC, also known as two-mode-coher ent) states respectively. Under resonance conditions, equal interaction times for both qubits and different initial preparations, we find that the entanglement transfer is more efficient for TMC than for TWB states. In the perspective of applications such as in cavity QED or with superconducting qubits, we analyze in details the effects of off-resonance interactions (detuning) and different interaction times for the two qubits, and discuss conditions to preserve the entanglement transfer.

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。

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