标题： 背景抑制在通过$W$状态投影的暗物质量子传感中的应用 显示英文标题

标题： Background Suppression in Quantum Sensing of Dark Matter via $W$ State Projection

摘要： 我们表明，通过将量子传感器投影到集体激发态来测量暗物质信号，可以显著抑制非集体噪声背景，从而显著提高灵敏度。 我们在存在暗物质效应和传感器退相干效应的情况下，追踪传感器状态的演化，优化协议执行时间，并表明通过传感器数量的因子来抑制背景是可能的。 此方法在信号积累时间内不需要传感器的纠缠，因此避免了在其他增强方案中存在的保持纠缠态寿命的困难。 该协议对于量子位传感器的类型也具有普遍性。 显示英文摘要

摘要： We show that measuring dark matter signal by projecting quantum sensors in the collective excited state can highly suppress the non-collective noise background, hence improving the sensitivity significantly. We trace the evolution of the sensors' state in the presence of both dark matter effect and sensors' decoherence effects, optimizing the protocol execution time, and show that the suppression of background by a factor equal to the number of sensors is possible. This method does not require the entanglement of sensors during the signal accumulation time, hence circumventing the difficulty of maintaining the lifetime of the entangled state that is present in other enhancement proposals. This protocol is also general regarding the type of qubit sensors.