Selective weak measurement reveals super ergotropy
- URL: http://arxiv.org/abs/2208.00634v2
- Date: Sun, 3 Sep 2023 13:04:09 GMT
- Title: Selective weak measurement reveals super ergotropy
- Authors: Mohammad Ali Balkanlu, Esfandyar Faizi and Bahram Ahansaz
- Abstract summary: ergotropy was previously introduced as the maximum extractable work from a quantum state.
In this work, we investigate the ergotropy in the presence of quantum correlation via weak measurement.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: The concept of ergotropy was previously introduced as the maximum extractable
work from a quantum state. Its enhancement, which is induced by quantum
correlation via projective measurement, was formulated as the daemonic
ergotropy. In this work, we investigate the ergotropy in the presence of
quantum correlation via weak measurement because of its elegant effects on the
measured system. By considering a bipartite correlated quantum system
consisting of main and ancillary systems, we demonstrate that the extractable
work by the non-selective weak measurement on the ancilla is always equal to
the situation captured by the strong measurement. However, the selective weak
measurement interestingly reveals more work than the daemonic ergotropy and the
ergotropy of the total system is greater than or equal to the daemonic
ergotropy. Moreover, it is shown that for Bell diagonal states, at the cost of
losing quantum correlation, the total extractable and thus non-local
extractable works can be increased by using measurement. Also, we find that
there is no direct relationship between quantum correlation and non-local
extractable work for these cases.
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