Quantum reversal: a general theory of coherent quantum absorbers
arXiv:2402.02502 · doi:10.22331/q-2025-02-26-1650
Abstract
The fascinating concept of coherent quantum absorber - which can absorb any photon emitted by another system while maintaining entanglement with that system - has found diverse implications in open quantum system theory and quantum metrology. This work generalizes the concept by proposing the so-called reversal conditions for the two systems, in which a "reverser" coherently reverses any effect of the other system on a field. The reversal conditions are rigorously boiled down to concise formulas involving the Petz recovery map and Kraus operators, thereby generalizing as well as streamlining the existing treatments of coherent absorbers.
21 pages, 1 figure. v3: revised and accepted by Quantum
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