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Quantum reference frames, with and without subsystems

Quantum reference frames (QRFs) are an extension of classical frames. Their framework allows us to put ourselves in a quantum system's shoes, to describe what it may experience and to compare how different subsystems of interest would describe each others.

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Usually, such subsytems are defined beforehand, as factors in a tensor product of the Hilbert space (or the algebra) of interest, and are the only reference frames considered. In this talk, we will see that in fact more general QRFs can be defined, going beyond the need of a tensor product. We show that every such choice of frame always corresponds to a reshuffling of the degrees of freedom into a compass and a relative space. We then describe how to transform between these generalized QRFs. We apply this method to interacting clocks, and to bosonic clocks, where the notion of subsytem may be blurred.

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Speaker:  Rémi Faure (Paris-Saclay)

Time: 14:00