JILA, NIST, and Department of Physics, University of Colorado, 440 UCB, Boulder, Colorado 80309, USA.
Center for Theory of Quantum Matter, University of Colorado, Boulder, Colorado 80309, USA.
Phys Rev Lett. 2018 Aug 17;121(7):070403. doi: 10.1103/PhysRevLett.121.070403.
Cavity QED is a promising avenue for the deterministic generation of entangled and spin-squeezed states for quantum metrology. One archetypal scheme generates squeezing via collective one-axis twisting interactions. However, we show that in implementations using optical transitions in long-lived atoms the achievable squeezing is fundamentally limited by collectively enhanced emission into the cavity mode which is generated in parallel with the cavity-mediated spin-spin interactions. We propose an alternative scheme which generates a squeezed state that is protected from collective emission, and investigate its sensitivity to realistic sources of experimental noise and imperfections.
腔 QED 是一种很有前途的方法，可以用于确定性地产生纠缠和自旋压缩态，用于量子计量学。一种典型的方案是通过集体单轴扭转相互作用产生压缩。然而，我们表明，在使用长寿命原子中的光学跃迁的实现中，可实现的压缩受到集体增强的发射到腔模中的限制，该腔模与腔介导的自旋-自旋相互作用同时产生。我们提出了一种产生受集体发射保护的压缩态的替代方案，并研究了它对实验噪声和不完美的实际来源的敏感性。
