加速测量产生纠缠光子：量子信息理论满足Unruh-Davies效应
Generating Entangled Photons from the Vacuum by Accelerated Measurements: Quantum Information Theory Meets the Unruh-Davies Effect
摘要：
基于著名的Unruh-Davies效应，我们研究了加速和静止观察者之间的投影测量和量子通信的影响。我们发现，投影测量均匀加速的观察者可以激发真正的粒子从惯性系中的真空，即使没有额外的粒子被创建的测量过程中的加速帧。此外，我们还证明了通过这种加速测量产生的粒子可以在惯性系中高度纠缠，并且也可以通过一定的测量安排来利用这个过程产生甚至最大纠缠的两量子比特态。作为我们分析的副产品，我们还表明，一个量子比特的信息可以完美地从加速观察者传输到惯性观察者。原则上，这种效应可以用于设计量子通信的纠缠态发生器。
英文摘要：
Building on the well-known Unruh-Davies effect, we examine the effects of projective measurements and quantum communications between accelerated and stationary observers. We find that the projective measurement by a uniformly accelerated observer can excite real particles from the vacuum in the inertial frame, even if no additional particles are created by the measurement process in the accelerating frame. Furthermore, we show that the particles created by this accelerating measurement can be highly entangled in the inertial frame, and it is also possible to use this process to generate even maximally entangled two-qubit states by a certain arrangement of measurements. As a byproduct of our analysis, we also show that a single qubit of information can be perfectly transmitted from the accelerating observer to the inertial one. In principle, such an effect could be exploited in designing an entangled state generator for quantum communication.
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