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Enlargement of optical Schrödinger's cat states
Nature Photonics ( IF 35.0 ) Pub Date : 2017-05-01 00:00:00 , DOI: 10.1038/nphoton.2017.57
Demid V. Sychev , Alexander E. Ulanov , Anastasia A. Pushkina , Matthew W. Richards , Ilya A. Fedorov , Alexander I. Lvovsky

Superpositions of macroscopically distinct quantum states, introduced in Schrödinger's famous Gedankenexperiment, are an epitome of quantum ‘strangeness’ and a natural tool for determining the validity limits of quantum physics. The optical incarnation of Schrödinger's cat (SC)—the superposition of two opposite-amplitude coherent states—is also the backbone of continuous-variable quantum information processing. However, the existing preparation methods limit the amplitudes of the component coherent states, which curtails the state's usefulness for fundamental and practical applications. Here, we convert a pair of negative squeezed SC states of amplitude 1.15 to a single positive SC state of amplitude 1.85 with a success probability of ∼0.2. The protocol consists in bringing the initial states into interference on a beamsplitter and a subsequent heralding quadrature measurement in one of the output channels. Our technique can be realized iteratively, so arbitrarily high amplitudes can, in principle, be reached.

中文翻译:

光学薛定optical猫状态的放大

Schrödinger著名的Gedanken实验中引入的宏观上截然不同的量子态叠加是量子“奇特性”的缩影,是确定量子物理学有效性极限的自然工具。薛定ding猫(SC)的光学化身-两个相反振幅相干态的叠加-也是连续可变量子信息处理的基础。然而,现有的制备方法限制了组分相干态的幅度,这限制了该态对于基本和实际应用的有用性。在这里,我们将一对振幅为1.15的负压缩SC状态转换为振幅为1.85的单个正SC状态,成功概率约为0.2。该协议包括在分束器上干扰初始状态,并在其中一个输出通道中进行后续的先导正交测量。我们的技术可以迭代实现,因此原则上可以达到任意高振幅。
更新日期:2017-06-01
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