Loss-tolerant quantum secure positioning with weak laser sources
arXiv:1607.08193 · doi:10.1103/PhysRevA.94.032315
Abstract
Quantum position verification (QPV) is the art of verifying the geographical location of an untrusted party. Recently, it has been shown that the widely studied Bennett & Brassard 1984 (BB84) QPV protocol is insecure after the 3 dB loss point assuming local operations and classical communication (LOCC) adversaries. Here, we propose a time-reversed entanglement swapping QPV protocol (based on measurement-device-independent quantum cryptography) that is highly robust against quantum channel loss. First, assuming ideal qubit sources, we show that the protocol is secure against LOCC adversaries for any quantum channel loss, thereby overcoming the 3 dB loss limit. Then, we analyze the security of the protocol in a more practical setting involving weak laser sources and linear optics. In this setting, we find that the security only degrades by an additive constant and the protocol is able to verify positions up to 47 dB channel loss.
11 pages, 3 figures. Partially based on an earlier work in arXiv:1510.04891
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- A single-qubit position verification protocol that is secure against multi-qubit attacks
- Quantum cryptography beyond key distribution: theory and experiment
- Single-qubit loss-tolerant quantum position verification protocol secure against entangled attackers
- Practically secure quantum position verification
- Making Existing Quantum Position Verification Protocols Secure Against Arbitrary Transmission Loss