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- W2016184023 abstract "Given a finite number of copies of an unknown qubit state that have already been measured optimally, can one still extract any information about the original unknown state? We give a positive answer to this question and quantify the information obtainable by a given observer as a function of the number of copies in the ensemble, and of the number of independent observers that, one after the other, have independently measured the same ensemble of qubits before him. The optimality of the protocol is proven and extensions to other states and encodings are also studied. According to the general lore, the state after a measurement has no information about the state before the measurement. Our results manifestly show that this statement has to be taken with a grain of salt, specially in situations where the quantum states encode confidential information." @default.
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- W2016184023 date "2010-09-01" @default.
- W2016184023 modified "2023-09-27" @default.
- W2016184023 title "Recycling of qubits" @default.
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- W2016184023 doi "https://doi.org/10.1088/0031-8949/2010/t140/014059" @default.
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