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首页> 外文会议>Quantum information science and technology IV >A quantum Bell Test homodyne interferometer at ambient temperature for millimetre wave entangled photons
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A quantum Bell Test homodyne interferometer at ambient temperature for millimetre wave entangled photons

机译：室温下量子波贝尔测试零差干涉仪用于毫米波纠缠光子

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This paper investigates the feasibility of operating a Bell Test for millimetre wave entangled photons using ambient temperature instrumentation, raising the question as to whether this can be done in a regime where the photon energy (hf/e ～ 0.06 milli-eV at 10 GHz) is far smaller than the thermal energy (kT/e ～ 25 milli-eV at 290 K). It also raises the question as to whether it is possible to generate entangled photons at these frequencies, as previously this has only been achieved using cryogenically cooled Josephson junctions. A homodyne interferometric receiver is proposed whereby a millimetre wave pump generates entangled photons by spontaneous parametric down-conversion in a non-linear birefringent material, before the signal and idler are mixed together in a sum-frequency mixer. The output then enters a second mixer which uses the pump as the local oscillator to shift the signal and idler down to baseband, where signal integration over many successive entangled pair recovers the entanglement signature from the noise. A successful demonstration of this would mean cryogenics could be avoided, enabling more sensor architectures and deployment scenarios. Novel experiments in the millimetre wave band could lead to a deeper understanding of entanglement and offer novel schemes for secure communications and covert interrogation techniques (quantum radar and ghost imaging), exploiting the fact that the signal is below the level of the thermal noise and can only be accessed by a single user having the key, which is the pump.
机译：本文研究了使用环境温度仪器对毫米波纠缠光子进行贝尔测试的可行性，提出了一个问题，即是否可以在光子能量（在10 GHz下为hf / e〜0.06 mille-eV）的情况下进行远小于热能（在290 K时kT / e〜25毫电子伏特）。这也引起了关于是否有可能在这些频率下产生纠缠光子的问题，因为以前只能使用低温冷却的约瑟夫森结来实现。提出了一种零差干涉式接收机，其中毫米波泵在非线性双折射材料中通过自发的参量下变频产生纠缠光子，然后将信号和惰轮在和频混频器中混合在一起。然后，输出进入第二混频器，该混频器使用泵作为本地振荡器将信号和惰轮移至基带，在该处，许多连续纠缠对上的信号积分从噪声中恢复纠缠特征。成功证明这一点意味着可以避免低温，从而实现更多的传感器架构和部署方案。在毫米波波段进行的新颖实验可以使人们对纠缠有更深入的了解，并利用信号低于热噪声水平并且可以消除干扰的事实，为安全通信和秘密询问技术（量子雷达和幻影成像）提供新颖的方案。只有具有密钥（泵）的单个用户才能访问。

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