Eur. Phys. J. D 19, 129-132 (2002)
https://doi.org/10.1140/epjd/e20020065

Entangled quantum clocks for measuring proper-time difference

¹ Institute of Quantum Information Processing and Systems, University of Seoul, 90 Jeonnong, Tongdaemoon, Seoul 130-743, Korea
² Division of Semiconductor, Electricity, and Automobile Engineering, Woosuk University, 490 Hujeong, Samrye, Wanju, Cheonbuk 565-701, Korea

Corresponding authors: ^a wyhwang@qci.jst.go.jp - ^b dahn@uoscc.uos.ac.kr

Received: 7 November 2001
Published online: 15 April 2002

Abstract

We report that entangled pairs of quantum clocks (non-degenerate quantum bits) can be used as a specialized detector for precisely measuring difference of proper-times that each constituent quantum clock experiences. We describe why the proposed scheme would be more precise in the measurement of proper-time difference than a scheme of two-separate-quantum-clocks. We consider possibilities that the proposed scheme can be used in precision test of the relativity theory.