Micro-macro entanglement between light and matter
نویسندگان
چکیده
Quantum mechanics is undeniably a successful theory on all fronts. In contrast with the «classical» framework, it provides tools to understand and predict phenomena in the microscopic world. Adoption of the classical or quantum framework is not, however, a simple question of the size of the system under study. Additionally, there is no consensus on the meaning of macroscopicity, especially when entanglement is involved. Quantum optics is one of the main vehicles in the development of quantum information science and offer tools to study fundamental questions in quantum mechanics. We experimentally demonstrate the presence of entanglement in the system involving «macroscopic» photonic states after storage in the solid-state quantum memory. The possibility to distinguish between two macroscopic components of the state makes it analogous to Schrödinger’s cat state [1]. While the coupling to the atomic ensemble leads to the absolutely new physical quantum systems involving large number of the atoms and the photons at the same time which are entangled with microscopic object. To generate entanglement involving two macroscopically distinguishable components the displacement operation in the phase space can be applied [2, 3]. For this a photon pair entangled in polarization was generated from spontaneous parametric downconversion
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تاریخ انتشار 2015