关于用三脉冲光子回波忠实存储单光子的不可能性
On the impossibility of faithfully storing single-photons with the three-pulse photon echo
摘要：
三脉冲光子回波是一种在非均匀加宽的原子系综中存储强光脉冲的众所周知的技术。该协议是有吸引力的，因为它是相对简单的，它是非常适合于多个时间模式的存储。此外，它提供了非常长的存储时间，大于相位弛豫时间。在这里，我们认为三脉冲光子回波在两个和三个级别的系统作为一个潜在的技术在单光子水平的光存储。通过显式计算，我们表明，对应于一个单光子输入的回波信号和噪声之间的比值小于1。这严重限制了量子态存储的可实现保真度，使得三脉冲光子回波不适合单光子量子存储器。
英文摘要：
The three-pulse photon echo is a well-known technique to store intense light pulses in an inhomogeneously broadened atomic ensemble. This protocol is attractive because it is relatively simple and it is well suited for the storage of multiple temporal modes. Furthermore, it offers very long storage times, greater than the phase relaxation time. Here, we consider the three-pulse photon echo in both two- and three-level systems as a potential technique for the storage of light at the single-photon level. By explicit calculations, we show that the ratio between the echo signal corresponding to a single-photon input and the noise is smaller than one. This severely limits the achievable fidelity of the quantum state storage, making the three-pulse photon echo unsuitable for single-photon quantum memory.
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