Inspired by the protocol presented by Bagherinezhad and Karimipour[Phys.Rev.A 67(2003) 044302], which will be shown to be insecure,we present a multipartite quantum secret sharing protocol using reusable GreenbergerHo...Inspired by the protocol presented by Bagherinezhad and Karimipour[Phys.Rev.A 67(2003) 044302], which will be shown to be insecure,we present a multipartite quantum secret sharing protocol using reusable GreenbergerHorne -Zeilinger(GHZ) states.This protocol is robust against eavesdropping and could be used for the circumstance of many parties.展开更多
This paper presents a simple and novel quantum secret sharing scheme using GHZ-like state. The characteristics of the GHZ-like state are used to develop the quantum secret sharing scheme. In contrast with the other GH...This paper presents a simple and novel quantum secret sharing scheme using GHZ-like state. The characteristics of the GHZ-like state are used to develop the quantum secret sharing scheme. In contrast with the other GHZ-based QSS protocols with the same assumptions, the proposed protocol provides the best quantum bit efficiency.展开更多
A multiparty quantum secret sharing (MQSS) protocol with two-photon three-dimensional Bell states was proposed by Gao [Commun. Theor. Phys. 52 (2009) 421] recently. This study points out that the performance of Gao...A multiparty quantum secret sharing (MQSS) protocol with two-photon three-dimensional Bell states was proposed by Gao [Commun. Theor. Phys. 52 (2009) 421] recently. This study points out that the performance of Gao's protocol can be much improved by using the technique of decoy single photons and carefully modifying the protocol to remove some unnecessary unitary operations, devices, and transmissions.展开更多
Quantum secure direct communication is the direct communication of secret messages without need for establishing a shared secret key first.In the existing schemes,quantum secure direct communication is possible only w...Quantum secure direct communication is the direct communication of secret messages without need for establishing a shared secret key first.In the existing schemes,quantum secure direct communication is possible only when both parties are quantum.In this paper,we construct a three-step semiquantum secure direct communication(SQSDC)protocol based on single photon sources in which the sender Alice is classical.In a semiquantum protocol,a person is termed classical if he(she)can measure,prepare and send quantum states only with the fixed orthogonal quantum basis{|0,|1}.The security of the proposed SQSDC protocol is guaranteed by the complete robustness of semiquantum key distribution protocols and the unconditional security of classical one-time pad encryption.Therefore,the proposed SQSDC protocol is also completely robust.Complete robustness indicates that nonzero information acquired by an eavesdropper Eve on the secret message implies the nonzero probability that the legitimate participants can find errors on the bits tested by this protocol.In the proposed protocol,we suggest a method to check Eves disturbing in the doves returning phase such that Alice does not need to announce publicly any position or their coded bits value after the photons transmission is completed.Moreover,the proposed SQSDC protocol can be implemented with the existing techniques.Compared with many quantum secure direct communication protocols,the proposed SQSDC protocol has two merits:firstly the sender only needs classical capabilities;secondly to check Eves disturbing after the transmission of quantum states,no additional classical information is needed.展开更多
A multi-party quantum secret sharing protocol using two entangled states, φ0〉 = 1/√2 （1＋）n ＋ 1-）n） and （φ1）1） =1/√2 （1＋）n -1-〉n）, is proposed and analyzed. In this protocol, without requiring to gen...A multi-party quantum secret sharing protocol using two entangled states, φ0〉 = 1/√2 （1＋）n ＋ 1-）n） and （φ1）1） =1/√2 （1＋）n -1-〉n）, is proposed and analyzed. In this protocol, without requiring to generate any photon or do any local unitary operation, an agent can obtain a shadow of the secret key by simply performing a measurement of single photon. Furthermore, the security of the protocol is analyzed. It shows that no agent can obtain the manager＇s secret without the help of the other agents, and any eavesdropper will be detected if he/she tries to steal the manager＇s secret under ideal or noisy quantum channels.展开更多
基金Supported by National Natural Science Foundation of China under Grant Nos.60878059,11004033Natural Science Foundation of Fujian Province under Grant No.2010J01002
文摘Inspired by the protocol presented by Bagherinezhad and Karimipour[Phys.Rev.A 67(2003) 044302], which will be shown to be insecure,we present a multipartite quantum secret sharing protocol using reusable GreenbergerHorne -Zeilinger(GHZ) states.This protocol is robust against eavesdropping and could be used for the circumstance of many parties.
基金Supported by the National Science Council,Taiwan,China,under the Contract No.NSC 98-2221-E-006-097-MY3
文摘This paper presents a simple and novel quantum secret sharing scheme using GHZ-like state. The characteristics of the GHZ-like state are used to develop the quantum secret sharing scheme. In contrast with the other GHZ-based QSS protocols with the same assumptions, the proposed protocol provides the best quantum bit efficiency.
基金Supported by the National Science Council of Taiwan under Contract No. NSC99-2221-E-471-001
文摘A multiparty quantum secret sharing (MQSS) protocol with two-photon three-dimensional Bell states was proposed by Gao [Commun. Theor. Phys. 52 (2009) 421] recently. This study points out that the performance of Gao's protocol can be much improved by using the technique of decoy single photons and carefully modifying the protocol to remove some unnecessary unitary operations, devices, and transmissions.
基金supported by the National Natural Science Foundation of China(Grant Nos.61272058 and 61073054)the Natural Science Foundation of Guangdong Province of China(Grant Nos.10251027501000004 and S2012040007324)+1 种基金the Specialized Research Fund for the Doctoral Programof Higher Education of China(Grant No.20100171110042)the Science and Technology Project of Jiangmen City of China(Grant No.[2011]131)
文摘Quantum secure direct communication is the direct communication of secret messages without need for establishing a shared secret key first.In the existing schemes,quantum secure direct communication is possible only when both parties are quantum.In this paper,we construct a three-step semiquantum secure direct communication(SQSDC)protocol based on single photon sources in which the sender Alice is classical.In a semiquantum protocol,a person is termed classical if he(she)can measure,prepare and send quantum states only with the fixed orthogonal quantum basis{|0,|1}.The security of the proposed SQSDC protocol is guaranteed by the complete robustness of semiquantum key distribution protocols and the unconditional security of classical one-time pad encryption.Therefore,the proposed SQSDC protocol is also completely robust.Complete robustness indicates that nonzero information acquired by an eavesdropper Eve on the secret message implies the nonzero probability that the legitimate participants can find errors on the bits tested by this protocol.In the proposed protocol,we suggest a method to check Eves disturbing in the doves returning phase such that Alice does not need to announce publicly any position or their coded bits value after the photons transmission is completed.Moreover,the proposed SQSDC protocol can be implemented with the existing techniques.Compared with many quantum secure direct communication protocols,the proposed SQSDC protocol has two merits:firstly the sender only needs classical capabilities;secondly to check Eves disturbing after the transmission of quantum states,no additional classical information is needed.
基金supported by the National Science Council of the Republic of China,Taiwan,China (Grant No. NSC 98-2221-E-006-097-MY3)
文摘A multi-party quantum secret sharing protocol using two entangled states, φ0〉 = 1/√2 （1＋）n ＋ 1-）n） and （φ1）1） =1/√2 （1＋）n -1-〉n）, is proposed and analyzed. In this protocol, without requiring to generate any photon or do any local unitary operation, an agent can obtain a shadow of the secret key by simply performing a measurement of single photon. Furthermore, the security of the protocol is analyzed. It shows that no agent can obtain the manager＇s secret without the help of the other agents, and any eavesdropper will be detected if he/she tries to steal the manager＇s secret under ideal or noisy quantum channels.
