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Building on the well-known Unruh-Davies effect, we examine the effects ofprojective measurements and quantum communications between accelerated andstationary observers. We find that the projective measurement by a uniformlyaccelerated observer can excite real particles from the vacuum in the inertialframe, even if no additional particles are created by the measurement processin the accelerating frame. Furthermore, we show that the particles created bythis accelerating measurement can be highly entangled in the inertial frame,and it is also possible to use this process to generate even maximallyentangled two-qubit states by a certain arrangement of measurements. As abyproduct of our analysis, we also show that a single qubit of information canbe perfectly transmitted from the accelerating observer to the inertial one. Inprinciple, such an effect could be exploited in designing an entangled stategenerator for quantum communication.

Generating Entangled Photons from the Vacuum by Accelerated Measurements: Quantum Information Theory Meets the Unruh-Davies Effect