Recycling of quantum information: Multiple observations of quantum clocks

Details Recycling of quantum information: Multiple observations of quantum clocks Recycling of quantum information: Multiple observations of quantum clocks

2000-06-09

arxiv.org/abs/quant-ph/0006048v1

Physics

Quantum Physics

4 pages

Scientific paper

How much information about the original state preparation can be extracted from a quantum system which already has been measured? That is, how many independent (non-communicating) observers can measure the quantum system sequentially and give a nontrivial estimation of the original unknown state? We investigate these questions and we show from a simple example that quantum information is not entirely lost as a result of the measurement-induced collapse of the quantum state, and that an infinite number of independent observers who have no prior knowledge about the initial state can gain a partial information about the original preparation of the quantum system.

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