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arXiv 2201.11425quant-ph
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单光子空间分离特性在干涉仪两臂中的非透明联合探测

Unambiguous joint detection of spatially separated properties of a single photon in the two arms of an interferometer

Surya Narayan Sahoo, Sanchari Chakraborti, Som Kanjilal, Dipankar Home, Alex Matzkin, Urbasi Sinha

摘要:

量子叠加原理意味着进入干涉仪的粒子通过同时携带两个臂而演化。如果在每个臂上实现将粒子性质耦合到指针的非破坏性的、最小干扰的相互作用,同时保持路径叠加,则量子理论预测,对于在输出端口处测量的固定状态,某些粒子的性质可以只与一个或另一个路径。在这里,我们报告实现这一预测,通过联合观察的空间和偏振自由度的一个在干涉仪的两个臂中的单个光子。在每个臂中观察到显著的指针移位($\sim$ 50微米)。这种观察涉及在空间分离区域中耦合量子系统的不同性质,为量子信息协议和介观系统的量子性测试开辟了新的可能性。

英文摘要:

The quantum superposition principle implies that a particle entering an interferometer evolves by simultaneously taking both arms. If a non-destructive, minimally-disturbing interaction coupling a particle property to a pointer is implemented on each arm while maintaining the path superposition, quantum theory predicts that, for a fixed state measured at the output port, certain particle properties can be associated with only one or the other path. Here we report realization of this prediction through joint observation of the spatial and polarization degrees of freedom of a single photon in the two arms of an interferometer. Significant pointer shifts ($\sim$50 microns) are observed in each arm. This observation, involving coupling distinct properties of a quantum system in spatially separated regions, opens new possibilities for quantum information protocols and for tests of quantumness for mesoscopic systems.

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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