论文标题
Unruh-Dewitt检测器中的量子叠加中的探测器
Unruh-deWitt detectors in quantum superpositions of trajectories
论文作者
论文摘要
Unruh-Dewitt检测器已被广泛用作量子颗粒，纠缠和时空曲率的探针。在这里，我们扩展了与无质量标量场相互作用的Unruh-Dewitt检测器的标准处理，以包括在经典轨迹的量子叠加中传播的检测器。我们为检测器的最终状态得出了扰动表达，并表明它取决于沿单个轨迹本地评估的场相关函数，以及在超级轨迹之间的非局部相关函数。通过将我们的一般方法应用于两个均匀加速轨迹的叠加中的检测器，包括那些具有相等和不同适当加速的轨迹的轨迹，我们发现了在发射和吸收光谱中的新干扰效应。这些影响可以追溯到超跨轨迹之间的因果关系。最后，我们表明，通常，即使超级路径会单独产生相同的热状态，这种检测器也不会热化。
Unruh-deWitt detectors have been utilised widely as probes for quantum particles, entanglement and spacetime curvature. Here, we extend the standard treatment of an Unruh-deWitt detector interacting with a massless, scalar field to include the detector travelling in a quantum superposition of classical trajectories. We derive perturbative expressions for the final state of the detector, and show that it depends on field correlation functions evaluated locally along the individual trajectories, as well as non-locally between the superposed trajectories. By applying our general approach to a detector travelling in a superposition of two uniformly accelerated trajectories, including those with equal and differing proper accelerations, we discover novel interference effects in the emission and absorption spectra. These effects can be traced to causal relations between the superposed trajectories. Finally, we show that in general, such a detector does not thermalise even if the superposed paths would individually yield the same thermal state.
