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QWKLVSDSHUZHUHSRUWWKHILUVWGHPRQVWUDWLRQRI³FDYLW\HQKDQFHGUHSKDVHGDPSOLILHGVSRQWDQHRXVHPLVVLRQ´ . The rephased amplified spontaneous emission (RASE) protocol provides an a ll-in-one photon-pair source and quantum memory that has applications as a quantum repeater node. Cavity enhancement of the interaction of the optical mode with the ensemble has the potential to improve the fidelity of the entanglement of the photon pairs. Using heterodyne detection, amplified emission and photon echo induced rephased amplified emission were observed from a Pr 3+ doped Y 2 SiO 5 crystal placed in a Fabry-Perot cavity with a finesse of 70. Modifications to the experiment to allow non-classical correlations to be observed are discussed. Keywords: quantum memory, rare-earth doped crystal, photon echo 1. INTRODUCTION R ephased amplified spontaneous emission is a means of generating and storing entangled photon states, utilizing collective states of an atomic ensemble. In its use of collective atomic ensemble states generated via the measurement of spontaneous emission it is closely related to the scheme proposed in the quantum repeater architecture of Duan et al. commonly referred to as DLCZ [1] . In contrast to the DLCZ scheme , RASE applies photon echo techniques to read out the ensemble state, and thus is inherently temporally multimode. This temporal multimode operation is likely to be advantage ous in implementing quantum repeater protocols [2]. |
