1,394 research outputs found
Quantum Private Comparison: A Review
As an important branch of quantum secure multiparty computation, quantum
private comparison (QPC) has attracted more and more attention recently. In
this paper, according to the quantum implementation mechanism that these
protocols used, we divide these protocols into three categories: The quantum
cryptography QPC, the superdense coding QPC, and the entanglement swapping QPC.
And then, a more in-depth analysis on the research progress, design idea, and
substantive characteristics of corresponding QPC categories is carried out,
respectively. Finally, the applications of QPC and quantum secure multi-party
computation issues are discussed and, in addition, three possible research
mainstream directions are pointed out
On the performance of two protocols: SARG04 and BB84
We compare the performance of BB84 and SARG04, the later of which was
proposed by V. Scarani et al., in Phys. Rev. Lett. 92, 057901 (2004).
Specifically, in this paper, we investigate SARG04 with two-way classical
communications and SARG04 with decoy states. In the first part of the paper, we
show that SARG04 with two-way communications can tolerate a higher bit error
rate (19.4% for a one-photon source and 6.56% for a two-photon source) than
SARG04 with one-way communications (10.95% for a one-photon source and 2.71%
for a two-photon source). Also, the upper bounds on the bit error rate for
SARG04 with two-way communications are computed in a closed form by considering
an individual attack based on a general measurement. In the second part of the
paper, we propose employing the idea of decoy states in SARG04 to obtain
unconditional security even when realistic devices are used. We compare the
performance of SARG04 with decoy states and BB84 with decoy states. We find
that the optimal mean-photon number for SARG04 is higher than that of BB84 when
the bit error rate is small. Also, we observe that SARG04 does not achieve a
longer secure distance and a higher key generation rate than BB84, assuming a
typical experimental parameter set.Comment: 48 pages, 10 figures, 1 column, changed Figs. 7 and
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