Experimental demonstration of optimal probabilistic enhancement of quantum coherence

• URL: http://arxiv.org/abs/2108.00221v1
• Date: Sat, 31 Jul 2021 11:42:48 GMT
• Title: Experimental demonstration of optimal probabilistic enhancement of quantum coherence
• Authors: Robert St\'arek, Michal Mi\v{c}uda, Michal Kol\'a\v{r}, Radim Filip, Jarom\'ir Fiur\'a\v{s}ek
• Abstract summary: We investigate conditional enhancement of overall coherence of quantum states by probabilistic quantum operations. We identify the optimal filters that for a given probability of successful filtering maximize the output coherence.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We theoretically and experimentally investigate conditional enhancement of overall coherence of quantum states by probabilistic quantum operations that apply to the input state a quantum filter diagonal in the basis of incoherent states. We identify the optimal filters that for a given probability of successful filtering maximize the output coherence. We verify the performance of the studied quantum filters in a proof-of-principle experiment with linear optics, where a pair of two-level quantum systems is represented by polarization states of two photons. We comprehensively characterize the implemented two-qubit linear optical quantum filters by full quantum process tomography and we experimentally observe the optimal quantum coherence enhancement by quantum filtering.

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