Quantum data locking for high-rate private communication

Abstract

We show that, if the accessible information is used as a security quantifier, quantum channels with a certain symmetry can convey private messages at a tremendously high rate, as high as less than one bit below the rate of non-private classical communication. This result is obtained by exploiting the quantum data locking effect. The price to pay to achieve such a high private communication rate is that accessible information security is in general not composable. However, composable security holds against an eavesdropper who is forced to measure her share of the quantum system within a finite time after she gets it.

v3: Title is changed. Typos corrected. Close to the published version

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Cited by in corpus (11)

• Advances in Quantum Cryptography
• The Evolution of Quantum Secure Direct Communication: On the Road to the Qinternet
• A Quantum Enigma Machine: Experimentally Demonstrating Quantum Data Locking
• Experimental quantum data locking
• Optimal realistic attacks in continuous-variable quantum key distribution
• Continuous-variable quantum enigma machines for long-distance key distribution
• Photonic quantum data locking
• Quantum data hiding in the presence of noise
• Weak locking capacity of quantum channels can be much larger than private capacity
• Metric and classical fidelity uncertainty relations for random unitary matrices
• Fault tolerant quantum data locking