Leaking information to gain entanglement

• URL: http://arxiv.org/abs/2011.15116v1
• Date: Mon, 30 Nov 2020 18:49:45 GMT
• Title: Leaking information to gain entanglement
• Authors: Vikesh Siddhu
• Abstract summary: We find that engaging a system with its environment increases its ability to retain entanglement. We counter-intuitively boost the quantum capacity of a channel by leaking almost all quantum information to the channel's environment.
• Score: 3.8073142980733
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Entanglement lies at the root of quantum theory. It is a remarkable resource that is generally believed to diminish when entangled systems interact with their environment. On the contrary, we find that engaging a system with its environment increases its ability to retain entanglement. The maximum rate of retaining entanglement is given by the quantum channel capacity. We counter-intuitively boost the quantum capacity of a channel by leaking almost all quantum information to the channel's environment. This boost exploits two-letter level non-additivity in the channel's coherent information. The resulting non-additivity has a far larger magnitude and a qualitatively wider extent than previously known. Our findings have a surprising implication for quantum key distribution: maximum rates for key distribution can be boosted by allowing leakage of information to the eavesdropping environment.

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