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Quantum nondemolition measurement of microwave photons using engineered quadratic interactions

机译:利用工程二次相互作用对微波光子进行量子非爆破测量

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We present a quantum electrical circuit with Josephson junctions formed of two anharmonic oscillators coupled with an interaction g γ_1~2 γ_2~2, where γ1 and γ2 are positionlike coordinates. This type of coupling allows the quantum nondemolition measurement of the energy of one oscillator by monitoring the frequency of the second oscillator. Despite the fundamental tradeoff between the coupling strength g and maximum photonstorage capacity of the oscillators, it is possible to achieve high-fidelity detection of up to ten photons over time scale on the order of microseconds. We discuss the possibility of observing quantum jumps in the number of photons and related applications.
机译:我们提出了一个具有约瑟夫逊结的量子电路,该约瑟夫森结是由两个非谐振荡器组成的,并且相互作用为gγ_1〜2γ_2〜2,其中γ1和γ2是位置坐标。这种类型的耦合允许通过监视第二个振荡器的频率来对一个振荡器的能量进行量子非拆卸测量。尽管在耦合强度g和振荡器的最大光存储容量之间进行了基本权衡,但仍可能在微秒级的时间范围内实现多达十个光子的高保真度检测。我们讨论了观察光子数和相关应用中的量子跃迁的可能性。

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