scholarly journals Unconditionally Secure Relativistic Quantum Qubit Commitment

2021 ◽  
Vol 11 (23) ◽  
pp. 11416
Author(s):  
Houquan Liu ◽  
Libo Yuan
Keyword(s):  
Relativistic Quantum ◽  
Quantum Network ◽  
Quantum Bit ◽  
Bit Commitment ◽  
First Time

Quantum qubit commitment is a stronger version of the quantum bit commitment. It is impossible to realize unconditionally secure quantum qubit commitment in nonrelativistic domain. In this paper, we propose an unconditionally secure relativistic quantum qubit commitment protocol for the first time, which will have some unique applications in the upcoming era of quantum network.

A feasible and practically secure quantum bit commitment protocol

2021 ◽  
Author(s):  
Li Li ◽  
Run-Hua Shi
Keyword(s):  
Quantum Mechanics ◽  
Relativistic Quantum ◽  
Relativistic Quantum Mechanics ◽  
Quantum Bit ◽  
Practical Applications ◽  
Bit Commitment ◽  
Cryptographic Primitive ◽  
Modern Cryptography ◽  
Commitment Protocols

As a fundamental cryptographic primitive, bit commitment has lots of important and practical applications in modern cryptography. All previously proposed non-relativistic quantum bit commitment protocols cannot evade the Lo–Chau and Mayers attacks. Furthermore, relativistic quantum bit commitment protocols require rigorous spacetime constraints. In this paper, we present a simple, feasible but practically secure quantum bit commitment protocol without any spacetime constraint. The security of the proposed protocol is based on non-relativistic quantum mechanics, but it can resist all known attacks, including the Lo–Chau and Mayers attacks in practice.

scholarly journals Deterministic relativistic quantum bit commitment

2015 ◽  
Vol 13 (05) ◽  
pp. 1550029 ◽  
Author(s):  
Emily Adlam ◽  
Adrian Kent
Keyword(s):  
Quantum Entanglement ◽  
Relativistic Quantum ◽  
Quantum Bit ◽  
Bit Commitment ◽  
Perfect Security ◽  
Commitment Schemes ◽  
Local Randomness

We describe new unconditionally secure bit commitment schemes whose security is based on Minkowski causality and the monogamy of quantum entanglement. We first describe an ideal scheme that is purely deterministic, in the sense that neither party needs to generate any secret randomness at any stage. We also describe a variant that allows the committer to proceed deterministically, requires only local randomness generation from the receiver, and allows the commitment to be verified in the neighborhood of the unveiling point. We show that these schemes still offer near-perfect security in the presence of losses and errors, which can be made perfect if the committer uses an extra single random secret bit. We discuss scenarios where these advantages are significant.

Relativistic quantum bit commitment in real-time

2000 ◽  
Vol 90 (4) ◽  
pp. 714-723 ◽  
Author(s):  
S. N. Molotkov ◽  
S. S. Nazin
Keyword(s):  
Real Time ◽  
Relativistic Quantum ◽  
Quantum Bit ◽  
Bit Commitment

scholarly journals Strong no-go theorem for Gaussian quantum bit commitment

2010 ◽  
Vol 81 (1) ◽  
Author(s):  
Loïck Magnin ◽  
Frédéric Magniez ◽  
Anthony Leverrier ◽  
Nicolas J. Cerf
Keyword(s):  
Quantum Bit ◽  
Bit Commitment

scholarly journals Measurement-Device-Independent Two-Party Cryptography with Error Estimation

Sensors ◽  
2020 ◽  
Vol 20 (21) ◽  
pp. 6351
Author(s):  
Zishuai Zhou ◽  
Qisheng Guang ◽  
Chaohui Gao ◽  
Dong Jiang ◽  
Lijun Chen
Keyword(s):  
Error Estimation ◽  
Bit Error Rate ◽  
Error Rate ◽  
Cryptographic Protocols ◽  
Measurement Device ◽  
Joint Measurement ◽  
Quantum Bit ◽  
Bit Commitment ◽  
Innovative Method ◽  
Limited Power

We present an innovative method for quantum two-party cryptography. Our protocol introduces joint measurement and error estimation to improve the security of two-party cryptographic protocols. Our protocol removes the assumption of the attacker’s limited power and catches the attacking actions through highly estimated bit error rate. Our protocol is formally proved to be secure against both eavesdroppers and dishonest communication parties. We also utilize our designed protocol to construct two specific two-party cryptographic applications: Quantum bit commitment and quantum password identification.

Quantum bit commitment in a channel with noise

JETP Letters ◽  
2001 ◽  
Vol 73 (2) ◽  
pp. 107-113
Author(s):  
S. N. Molotkov ◽  
S. S. Nazin
Keyword(s):  
Quantum Bit ◽  
Bit Commitment
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