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Weak measurement reveals super ergotropy | | Esfandyar Faizi
; Mohammad Ali Balkanlu
; | | Date: |
1 Aug 2022 | | Abstract: | The concept of "ergotropy" has previously been introduced as the maximum work
that can be extracted from a quantum state. The enhancement of it, that is
induced by quantum correlations via projective measurement, was formulated as
the ’daemonic ergotropy’. In this paper, we investigated the ergotropy in the
presence of quantum correlation via the weak measurement because of its elegant
effects on the measured system. In a bipartite correlated quantum system that
decomposed of main and ancillary systems, we showed that the extractable work
by the non-selective weak measurement on ancilla is always equal to the
situation captured by the strong measurement. As such, the selective weak
measurement reveals more work than the daemonic ergotropy. The ergotropy of the
total system is also greater than or equal to the daemonic ergotropy. We showed
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
means of measurement. We also show that for these cases, there is no direct
relationship between quantum correlation and non-local extractable work. | | Source: | arXiv, 2208.00634 | | Services: | Forum | Review | PDF | Favorites | |
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