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Showing 2021 · quant-phShow all
3 papers · 2 filters
quant-ph2021★ 7 cited
Maximum logarithmic derivative bound on quantum state estimation as a dual of the Holevo bound
Koichi Yamagata
In quantum estimation theory, the Holevo bound is known as a lower bound of weighed traces of covariances of unbiased estimators. The Holevo bound is defined by a solution of a min…
quant-ph2021★ 11 cited
Broadband-laser-diode pumped PPKTP-Sagnac polarization-entangled photon source
Neng Cai, Wu-Hao Cai, Shun Wang +3
We experimentally demonstrate a polarization-entangled photon source at 810 nm using a type-II phase-matched PPKTP crystal pumped by a low-cost, broadband laser diode with a centra…
quant-ph2021★ 15 cited
Universal limitation of quantum information recovery: symmetry versus coherence
Hiroyasu Tajima, Keiji Saito
Quantum information is scrambled via chaotic time evolution in many-body systems. The recovery of initial information embedded locally in the system from the scrambled quantum stat…