Quantum Bit Commitment and the Reality of the Quantum State

  title={Quantum Bit Commitment and the Reality of the Quantum State},
  author={R. Srikanth},
  journal={Foundations of Physics},
  • R. Srikanth
  • Published 2018
  • Computer Science, Physics, Mathematics
  • Foundations of Physics
Quantum bit commitment is insecure in the standard non-relativistic quantum cryptographic framework, essentially because Alice can exploit quantum steering to defer making her commitment. Two assumptions in this framework are that: (a) Alice knows the ensembles of evidence E corresponding to either commitment; and (b) system E is quantum rather than classical. Here, we show how relaxing assumption (a) or (b) can render her malicious steering operation indeterminable or inexistent, respectively… Expand
3 Citations
Unconditionally secure quantum bit commitment based on the uncertainty principle
  • G. He
  • Computer Science, Physics
  • 2017
A simple QBC protocol is proposed which manages to evade the no-go proofs and is found that in high-dimensional systems, there exist some states which can display a chaos effect in quantum steering. Expand
Unconditionally secure quantum bit commitment based on the uncertainty principle
Unconditionally secure quantum bit commitment (QBC) was considered impossible. But the no-go proofs are based on the Hughston–Jozsa–Wootters (HJW) theorem (a.k.a. the Uhlmann theorem). Recently, itExpand


Unconditionally secure quantum bit commitment is impossible
It is shown that the claim that quantum cryptography can provide protocols that are unconditionally secure, that is, for which the security does not depend on any restriction on the time, space, or technology available to the cheaters, does not hold for any quantum bit commitment protocol. Expand
Quantum key distribution based on orthogonal states allows secure quantum bit commitment
  • G. He
  • Computer Science, Mathematics
  • 2011
A QBC protocol is built in which the density matrices of the quantum states encoding the commitment do not satisfy a crucial condition on which the no-go proofs of QBC are based, so that theNo- go proofs could be evaded. Expand
Impossibility of unconditionally secure commitment of a certified classical bit
In a secure bit commitment protocol involving only classical physics, A commits either a $0$ or a $1$ to B. If quantum information is used in the protocol, A may be able to commit a state of the formExpand
Experimental bit commitment based on quantum communication and special relativity.
This paper reports on an implementation of a bit commitment protocol using quantum communication and special relativity and has the advantage that it is practically feasible with arbitrary large separations between the agents in order to maximize the commitment time. Expand
Secret parameters in quantum bit commitment
The no-go theorem of unconditionally secure quantum bit commitment depends crucially on the assumption that Alice knows in detail all the probability distributions generated by Bob. We show that if aExpand
A short impossibility proof of quantum bit commitment
Bit commitment protocols, whose security is based on the laws of quantum mechanics alone, are generally held to be impossible on the basis of a concealment-bindingness tradeoff (1, 2). A strengthenedExpand
Practical Relativistic Bit Commitment.
This Letter revisits a previously proposed scheme that realizes bit commitment using only classical communication and proposes a novel multiround scheme based on finite-field arithmetic that extends the commitment time beyond this limit, and proves its security against classical attacks. Expand
Unconditionally Secure Bit Commitment by Transmitting Measurement Outcomes
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  • Computer Science, Medicine
  • Physical review letters
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A new unconditionally secure bit commitment scheme based on Minkowski causality and the properties of quantum information is proposed based on Bennett-Brassard 1984 qubits and the impossibility of superluminal signalling. Expand
Secure Bit Commitment From Relativistic Constraints
It is argued that classical protocols are insecure under global command in the split model the authors consider and a rigorous security proof in the global command model for Kent's quantum protocol is provided. Expand
Unconditionally secure quantum bit commitment using infinite-dimensional systems
  • G. He
  • Computer Science
  • 2017
A simple QBC protocol is proposed which manages to evade the no-go proofs and is based on the Hughston-Jozsa-Wootters theorem. Expand