Non-classical correlations between single photons and phonons from a mechanical oscillator
Non-classical correlations between single photons and phonons from a mechanical oscillator
复制标题
DOI：
10.1038/nature16536
复制
发表时间：
2016-02-18
期刊：
影响因子：
64.8
通讯作者：
Groblacher, Simon
中科院分区：
文献类型：
--
作者：
Riedinger, Ralf;Hong, Sungkun;Groblacher, Simon
单光子与另一个量子系统的接口是现代量子信息科学的关键能力。它允许物质的量子态，例如原子（1，2），原子系综（3，4）或固体（5）的自旋态，通过光子计数来制备和操纵，特别是在长距离上分布。这种光-物质界面对于量子物理学的基本测试和量子网络的实现至关重要。在这里，我们报告了单光子和声子之间的非经典相关性，声子是来自纳米机械谐振器的机械运动量子。我们实现了一个完整的量子协议，涉及初始化的谐振器在其量子基态的运动和随后的生成和读出相关的光子-声子对。观察到的柯西-施瓦茨不等式的违反是产生的机械状态的非经典性质的明确证据。我们的研究结果表明，片上固态机械谐振器作为光物质量子接口的可用性。我们实现的性能将使宏观量子现象的研究（8）以及在量子通信（9），量子存储器（10）和量子换能器（11，12）中的应用成为可能。
Interfacing a single photon with another quantum system is a key capability in modern quantum information science. It allows quantum states of matter, such as spin states of atoms(1,2), atomic ensembles(3,4) or solids(5), to be prepared and manipulated by photon counting and, in particular, to be distributed over long distances. Such light-matter interfaces have become crucial to fundamental tests of quantum physics(6) and realizations of quantum networks(7). Here we report non-classical correlations between single photons and phonons-the quanta of mechanical motionfrom a nanomechanical resonator. We implement a full quantum protocol involving initialization of the resonator in its quantum ground state of motion and subsequent generation and read-out of correlated photon-phonon pairs. The observed violation of a Cauchy-Schwarz inequality is clear evidence for the non-classical nature of the mechanical state generated. Our results demonstrate the availability of on-chip solid-state mechanical resonators as light-matter quantum interfaces. The performance we achieved will enable studies of macroscopic quantum phenomena(8) as well as applications in quantum communication(9), as quantum memories(10) and as quantum transducers(11,12).