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arXiv quant-ph/0605095quant-ph
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光与物质之间的量子隐形传态

Quantum teleportation between light and matter

Jacob Sherson, Hanna Krauter, Rasmus K. Olsson, Brian Julsgaard, Klemens Hammerer, Ignacio Cirac, Eugene S. Polzik

摘要:

量子隐形传态是分布式量子网络的重要组成部分,也可以作为量子计算机的基本操作。隐形传态最初被证明是将一束光的量子态转移到另一束光上;后来的发展使用了光学中继,并证明了连续变量的纠缠交换。在两个单一物质粒子(被捕获的离子)之间的量子态的隐形传态现在也已经实现。在这里,我们展示了不同性质的物体之间的隐形传态-光和物质,分别代表“飞行”和“静止”媒体。一个编码在光脉冲中的量子态被传送到一个宏观物体上(一个包含10^12个铯原子的原子系综)。确定性隐形传态的平均光子数(n)高达几百组的相干态实现。当n=20时,量子效率为0.58 ± 0.02,当n=5时,量子效率为0.60 ± 0.02,比任何经典的态转移都要高。除了基本的兴趣,隐形传态使用宏观原子系综是相关的量子中继器的实际实现。实现量子网络的一个重要因素是发射器和接收器之间的隐形传态距离;在本实验中,这是0.5米。由于我们的实验使用传播光来实现隐形传态所需的光和原子的纠缠,因此目前的方法应该可以扩展到更长的距离。

英文摘要:

Quantum teleportation is an important ingredient in distributed quantum networks, and can also serve as an elementary operation in quantum computers. Teleportation was first demonstrated as a transfer of a quantum state of light onto another light beam; later developments used optical relays and demonstrated entanglement swapping for continuous variables. The teleportation of a quantum state between two single material particles (trapped ions) has now also been achieved. Here we demonstrate teleportation between objects of a different nature - light and matter, which respectively represent 'flying' and 'stationary' media. A quantum state encoded in a light pulse is teleported onto a macroscopic object (an atomic ensemble containing 10^12 caesium atoms). Deterministic teleportation is achieved for sets of coherent states with mean photon number (n) up to a few hundred. The fidelities are 0.58+-0.02 for n=20 and 0.60+-0.02 for n=5 - higher than any classical state transfer can possibly achieve. Besides being of fundamental interest, teleportation using a macroscopic atomic ensemble is relevant for the practical implementation of a quantum repeater. An important factor for the implementation of quantum networks is the teleportation distance between transmitter and receiver; this is 0.5 metres in the present experiment. As our experiment uses propagating light to achieve the entanglement of light and atoms required for teleportation, the present approach should be scalable to longer distances.

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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