Title:	Quantum bit commitment with a composite evidence
Authors:	Srikanth, R.
Issue Date:	23-Mar-2004
Publisher:	IOP Publishing Ltd.
Citation:	Physica Scripta, 2004, Vol.70, p343-346
Abstract:	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 × (for b = 1) basis. She then communicates to him the (classical) measurement outcome Rx and the partmeasured anonymous state interpolated into other, randomly prepared qubits as her evidence-of-commitment.
Description:	Restricted Access.
URI:	http://hdl.handle.net/2289/3062
ISSN:	0031-8949 1402-4896 (Online)
Alternative Location:	http://dx.doi.org/10.1088/0031-8949/70/6/002
Copyright:	2004 IOP Publishing Ltd.
Appears in Collections:	Research Papers (LAMP)

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