电路量子电动力学中的光子数压缩
Photon-Number Squeezing in Circuit Quantum Electrodynamics
摘要：
一种超导单电子晶体管（SSET），其耦合到非谐振器，一个约瑟夫森结-L-C电路，可以驱动后者到一个非平衡光子数态。通过偏置的SSET在一个制度，其中的电流是由非弹性准粒子隧穿和相干库珀对隧穿（约瑟夫森准粒子循环）的组合进行，冷却的振荡器以及激光一样的光子数的增强可以实现。在这里，我们表明，截止准粒子隧穿率由于超导能隙，结合非谐振荡器，可能会产生强烈的压缩光子数分布。对于低损耗的振荡器几乎纯Fock态可以产生。
英文摘要：
A superconducting single-electron transistor (SSET) coupled to an anharmonic oscillator, e.g., a Josephson junction-L-C circuit, can drive the latter to a nonequilibrium photon number state. By biasing the SSET in a regime where the current is carried by a combination of inelastic quasiparticle tunneling and coherent Cooper-pair tunneling (Josephson quasiparticle cycle), cooling of the oscillator as well as a laser like enhancement of the photon number can be achieved. Here we show, that the cut-off in the quasiparticle tunneling rate due to the superconducting gap, in combination with the anharmonicity of the oscillator, may create strongly squeezed photon number distributions. For low dissipation in the oscillator nearly pure Fock states can be produced.
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