期刊
PHYSICAL REVIEW X
卷 8, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevX.8.041038
关键词
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资金
- UK EPSRC [EP/K034480/1]
- KIST Institutional Program [2E26680-18-P025]
- National Research Foundation of Singapore Fellowship [NRF-NRFF2016-02]
- National Research Foundation
- L'Agence Nationale de la Recherche [NRF2017-NRF-ANR004 VanQuTe]
- Singapore Ministry of Education Tier 1 [RG190/17]
- Samsung GRO project
- Royal Society
- EPSRC [EP/K034480/1] Funding Source: UKRI
Genuinely quantum states of a harmonic oscillator may be distinguished from their classical counterparts by the Glauber-Sudarshan P representation-a state lacking a positive P function is said to be nonclassical. In this paper, we propose a general operational framework for studying nonclassicality as a resource in networks of passive linear elements and measurements with feed forward. Within this setting, we define new measures of nonclassicality based on the quantum fluctuations of quadratures, as well as the quantum Fisher information of quadrature displacements. These measures lead to fundamental constraints on the manipulation of nonclassicality, especially its concentration into subsystems, that apply to generic multimode non-Gaussian states. Special cases of our framework include no-go results in the concentration of squeezing and a complete hierarchy of nonclassicality for single-mode Gaussian states.
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