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- W2971193039 abstract "When the von Neumann entropy of a quantum system is increased by measurements, part of its information is lost. To faithfully reflect such a gain-loss relation, we propose the Information Retrievability (IR) and Information Loss (IL), which depend only on the density matrix of the system before and after measurements. We explain that, after a pure quantum state collapses to a maximal mixed state, it gets the maximal entropy together with the maximal info loss, and its discrete uniform distribution contains only classical info. Then we compute the entropy, IR and IL for systems of single-qubit, entangled qubits (like Bell, GHZ, W state) and the 2-qubit Werner (mixed) state with their dependence on various parameters. We notice that, since the data-exchange between the two observers in Bell tests can recover certain critical quantum info, the related quantum entropy should be removable (a possible dilemma linked to quantum non-locality). We show that, measuring the Bell, GHZ and the marginally entangled Werner state will produce the same minimal entropy gain, accompanied by equal minimal info loss." @default.
- W2971193039 created "2019-09-05" @default.
- W2971193039 creator A5080013540 @default.
- W2971193039 date "2019-08-28" @default.
- W2971193039 modified "2023-09-27" @default.
- W2971193039 title "Entropy Gain and Information Loss by Measurements." @default.
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