Quantum Bit Commitment with a Composite Evidence

Details Quantum Bit Commitment with a Composite Evidence Quantum Bit Commitment with a Composite Evidence

2003-06-23

arxiv.org/abs/quant-ph/0306155v4

Physica Scripta 70, 343 (2004)

Physics

Quantum Physics

6 pages, minor changes, journal reference added

Scientific paper

Entanglement-based attacks, which are subtle and powerful, are usually believed to render quantum bit commitment insecure. We point out that the no-go argument leading to this view implicitly assumes the evidence-of-commitment to be a monolithic quantum system. We argue that more general evidence structures, allowing for a composite, hybrid (classical-quantum) evidence, conduce to improved security. In particular, we present and prove the security of the following protocol: Bob sends Alice an anonymous state. She inscribes her commitment $b$ by measuring part of it in the + (for $b = 0$) or $\times$ (for $b=1$) basis. She then communicates to him the (classical) measurement outcome $R_x$ and the part-measured anonymous state interpolated into other, randomly prepared qubits as her evidence-of-commitment.

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