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• W2786563485 startingPage "823" @default.
• W2786563485 abstract "We define a new quantifier of classicality for a quantum state, the Roughness, which is given by the L2(R2) distance between Wigner and Husimi functions. We show that the Roughness is bounded and therefore it is a useful tool for comparison between different quantum states for single bosonic systems. The state classification via the Roughness is not binary, but rather it is continuous in the interval [0,1], being the state more classic as the Roughness approaches to zero, and more quantum when it is closer to the unity. The Roughness is maximum for Fock states when its number of photons is arbitrarily large, and also for squeezed states at the maximum compression limit. On the other hand, the Roughness approaches its minimum value for thermal states at infinite temperature and, more generally, for infinite entropy states. The Roughness of a coherent state is slightly below one half, so we may say that it is more a classical state than a quantum one. Another important result is that the Roughness performs well for discriminating both pure and mixed states. Since the Roughness measures the inherent quantumness of a state, we propose another function, the Dynamic Distance Measure (DDM), which is suitable for measure how much quantum is a dynamics. Using DDM, we studied the quartic oscillator, and we observed that there is a certain complementarity between dynamics and state, i.e. when dynamics becomes more quantum, the Roughness of the state decreases, while the Roughness grows as the dynamics becomes less quantum." @default.
• W2786563485 created "2018-02-23" @default.
• W2786563485 creator A5002759623 @default.
• W2786563485 creator A5005913484 @default.
• W2786563485 creator A5044914223 @default.
• W2786563485 creator A5078764243 @default.
• W2786563485 date "2018-03-01" @default.
• W2786563485 modified "2023-10-06" @default.
• W2786563485 title "Roughness as classicality indicator of a quantum state" @default.
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