Single-state semiquantum private comparison based on Bell states

EPJ Quantum Technology

Table 4 Comparison results of our SQPC protocol and the previous SQPC protocols with Bell states

	The protocol of Ref. [39]	The protocol of Ref. [43]	The protocol of Ref. [44]	The second protocol of Ref. [48]	The protocol of Ref. [49]	The protocol of Ref. [50]	The protocol of Ref. [53]	Our protocol
Feature	Randomization-based	Measure-resend	Measure-resend	Measure-Randomization-resend	Discard-resend	Measure-discard-resend	Measure-resend	Measure-resend
Types of	Single	Four	Four	Four	Four	Four	Four	Single
Bell states
Usage of SQKD or SQKA	No	No	Yes	Yes	Yes	Yes	Yes	Yes
Usage of quantum entanglement swapping	No	Yes	No	No	No	No	No	No
Usage of unitary operations	No	No	No	No	No	No	No	No
Usage of delay lines	Yes	No	Yes	Yes	No	No	No	No
TP’s knowledge about the comparison result	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Qubit efficiency	\(\frac{1}{10}\)	\(\frac{1}{82}\)	\(\frac{1}{60}\)	\(\frac{1}{32}\)	\(\frac{1}{48}\)	\(\frac{1}{36}\)	\(\frac{1}{58}\)	\(\frac{1}{70}\)