Instytut Podstawowych Problemów Techniki
Polskiej Akademii Nauk

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Tang Jun-Feng


Ostatnie publikacje
1.  Yuan Y., Zhibo H., Jun-Feng T., Streltsov A., Guo-Yong X., Chuan-Feng L., Guang-Can G., Direct estimation of quantum coherence by collective measurements, NPJ Quantum Information, ISSN: 2056-6387, DOI: 10.1038/s41534-020-0280-6, Vol.6, pp.1-5, 2020

Streszczenie:
The recently established resource theory of quantum coherence allows for a quantitative understanding of the superposition principle, with applications reaching from quantum computing to quantum biology. While different quantifiers of coherence have
been proposed in the literature, their efficient estimation in today’s experiments remains a challenge. Here, we introduce a collective measurement scheme for estimating the amount of coherence in quantum states, which requires entangled measurements on two copies of the state. As we show by numerical simulations, our scheme outperforms other estimation methods based on tomography or adaptive measurements, leading to a higher precision in a large parameter range for estimating established coherence quantifiers of qubit and qutrit states. We show that our method is accessible with today’s technology by implementing it experimentally with photons, finding a good agreement between experiment and theory.

Afiliacje autorów:
Yuan Y. - inna afiliacja
Zhibo H. - inna afiliacja
Jun-Feng T. - inna afiliacja
Streltsov A. - inna afiliacja
Guo-Yong X. - inna afiliacja
Chuan-Feng L. - inna afiliacja
Guang-Can G. - inna afiliacja

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