A generalization of the Entropy Power Inequality to Bosonic Quantum Systems

Abstract

In most communication schemes information is transmitted via travelling modes of electromagnetic radiation. These modes are unavoidably subject to environmental noise along any physical transmission medium and the quality of the communication channel strongly depends on the minimum noise achievable at the output. For classical signals such noise can be rigorously quantified in terms of the associated Shannon entropy and it is subject to a fundamental lower bound called entropy power inequality. Electromagnetic fields are however quantum mechanical systems and then, especially in low intensity signals, the quantum nature of the information carrier cannot be neglected and many important results derived within classical information theory require non-trivial extensions to the quantum regime. Here we prove one possible generalization of the Entropy Power Inequality to quantum bosonic systems. The impact of this inequality in quantum information theory is potentially large and some relevant implications are considered in this work.

References in corpus (5)

• Ultimate communication capacity of quantum optical channels by solving the Gaussian minimum-entropy conjecture
• A solution of the Gaussian optimizer conjecture
• Quantum state majorization at the output of bosonic Gaussian channels
• Classical capacity of bosonic broadcast communication and a new minimum output entropy conjecture
• Limits on classical communication from quantum entropy power inequalities

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