Device-independent quantum key distribution secure against adversaries with no long-term quantum memory

Abstract

Device-Independent Quantum Key Distribution (DIQKD) is a formalism that supersedes traditional quantum key distribution, as its security does not rely on any detailed modelling of the internal working of the devices. This strong form of security is possible only using devices producing correlations that violate a Bell inequality. Full security proofs of DIQKD have been recently reported, but they tolerate zero or small amounts of noise and are restricted to protocols based on specific Bell inequalities. Here, we provide a security proof of DIQKD that is both more efficient and noise resistant, and also more general as it applies to protocols based on arbitrary Bell inequalities and can be adapted to cover supra-quantum eavesdroppers limited by the no-signalling principle only. It requires, however, the extra assumption that the adversary does not have a long-term quantum memory, a condition that is not a limitation at present since the best existing quantum memories have very short coherence times.

13 pages, 1 figure. v2: minor modifications

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Cited by in corpus (29)

• Bell nonlocality
• Physical characterization of quantum devices from nonlocal correlations
• On nonlocality as a resource theory and nonlocality measures
• Device-independent quantum key distribution with single-photon sources
• Device-independent tomography of multipartite quantum states
• Towards a realization of device-independent quantum key distribution
• Bell nonlocality is not sufficient for the security of standard device-independent quantum key distribution protocols
• Secrecy in prepare-and-measure CHSH tests with a qubit bound
• Characterization of quantum correlations with local dimension constraints and its device-independent applications
• Elemental and tight monogamy relations in nonsignalling theories
• Energy as a detector of nonlocality of many-body spin systems
• Device-independent randomness generation from several Bell estimators
• Improving the performance of quantum cryptography by using the encryption of the error correction data
• Randomness versus nonlocality in the Mermin-Bell experiment with three parties
• Entropy bounds for multiparty device-independent cryptography
• Device-Independent Bit Commitment based on the CHSH Inequality
• Finite-key security analysis of differential-phase-shift quantum key distribution
• Experimental semi-device-independent certification of entangled measurements
• Multipartite Nonlocality as a Resource and Quantum Correlations Having Indefinite Causal Order
• Simple conditions constraining the set of quantum correlations
• Device-independent quantum key distribution with spin-coupled cavities
• Optimal randomness generation from optical Bell experiments
• Bounding the persistency of the nonlocality of W states
• Upper bounds on key rates in device-independent quantum key distribution based on convex-combination attacks
• Implementations for Device-Independent Quantum Key Distribution
• Simple and tight monogamy relations for a class of Bell inequalities
• Quantifying the randomness of copies of noisy Popescu-Rohrlich correlations
• Local hidden variable values without optimization procedures
• Effects of Topological Boundary Conditions on Bell Nonlocality