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Two quantum private query protocols based on Bell states and single photons.
- Source :
-
Modern Physics Letters A . 1/20/2021, Vol. 36 Issue 2, pN.PAG-N.PAG. 17p. - Publication Year :
- 2021
-
Abstract
- This paper proposes two quantum privacy query protocols. In the single vector sub-privacy query of protocol 1, it is proposed for the first time to distinguish different measurement results by publishing 2 bits of classic information. In the protocol, the database Bob selects the Z base and the Bell base to measure the particles sent by Alice according to the key value of the encrypted database and publishes 2 bits of classic information based on the measurement results. The user Alice infers the key value of the encrypted database through these two pieces of classic information. In the two-way quantum privacy query of protocol 2, the database Bob measures the particles sent back by Alice, converts the measurement result into a key value of length 3, and prepares a particle that is the same as the measurement result and sends it back to Alice. Alice returns the measurement of particles can infer a set of data encryption keys, and the length of each key is 3 bits. Users in the two protocols proposed in the article can obtain the query key with a probability of 1/4. As the key length increases, the number of query bits in protocol 2 decreases, but the probability of execution failure increases. But protocol 2 has a higher quantum efficiency. Both protocols can guarantee the privacy of users and databases. [ABSTRACT FROM AUTHOR]
- Subjects :
- *PHOTONS
*QUANTUM efficiency
*DATA encryption
*BELLS
*INFORMATION measurement
Subjects
Details
- Language :
- English
- ISSN :
- 02177323
- Volume :
- 36
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Modern Physics Letters A
- Publication Type :
- Academic Journal
- Accession number :
- 148303028
- Full Text :
- https://doi.org/10.1142/S021773232150005X