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Chinese Physics B 2015年第5期24卷 210-222页

作者： jino heo Chang-Ho Hong Jong-In Lim Hyung-Jin Yang Graduate School of Information Security (GSIS) Korea University Center for Information Security Technologies (CIST) Korea University Department of Physics Korea University

We propose an arbitrary controlled-unitary （CU） gate and a bidirectional quantum teleportation （BQTP） scheme. The proposed CU gate utilizes photonic qubits （photons） with cross-Kerr nonlinearities （XKNLs）, X-homodyne detectors, and linear optical elements, and consists of the consecutive operation of a controlled-path （C-path） gate and a gathering-path （G- path） gate. It is almost deterministic and feasible with current technology when a strong coherent state and weak XKNLs are employed. Based on the CU gate, we present a BQTP scheme that simultaneously teleports two unknown photons between distant users by transmitting only one photon in a path-polarization intra-particle hybrid entangled state. Consequently, it is possible to experimentally implement BQTP with a certain success probability using the proposed CU gate.

关键词： cross-Kerr nonlinearity bidirectional quantum teleportation intra-particle hybrid entanglement

Bidirectional transfer of quantum information for unknown photons via cross-Kerr nonlinearity and photon-number-resolving measurement

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Chinese Physics B 2016年第2期25卷 82-92页

作者： jino heo Chang-Ho Hong Dong-Hoon Lee Hyung-Jin Yang Graduate School of Information Security (GSIS) Korea University Center for Information Security Technologies (CIST) Korea University Department of Physics Korea University

We propose an arbitrary controlled-unitary （CU） gate and a bidirectional transfer scheme of quantum information （BTQI） for unknown photons. The proposed CU gate utilizes quantum non-demolition photon-number-resolving measure- ment based on the weak cross-Kerr nonlinearities （XKNLs） and two quantum bus beams; the proposed CU gate consists of consecutive operations of a controlled-path gate and a gathering-path gate. It is almost deterministic and is feasible with current technology when a strong amplitude of the coherent state and weak XKNLs are employed. Compared with the existing optical multi-qubit or controlled gates, which utilize XKNLs and homodyne detectors, the proposed CU gate can increase experimental realization feasibility and enhance robustness against decoherence. According to the CU gate, we present a BTQI scheme in which the two unknown states of photons between two parties （Alice and Bob） are mutually swapped by transferring only a single photon. Consequently, by using the proposed CU gate, it is possible to experimentally implement the BTQI scheme with a certain probability of success.

关键词： cross-Kerr nonlinearity quantum non-demolition photon-number-resolving measurement bidirec-tional transfer of quantum information

Quantum secure direct communication network with hyperentanglement

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Chinese Physics B 2014年第9期23卷 107-111页

作者： Chang Ho Hong jino heo Jong In Lim Hyung Jin Yang Graduate School of Information Management and Security Korea University Center for Information Security Technologies (CIST) Korea University Department of Physics Korea University Graduate School of Information Security (GSIS) Korea University

We propose a quantum secure direct communication protocol with entanglement swapping and hyperentanglement. Any two users, Alice and Bob, can communicate with each other in a quantum network, even though there is no direct quantum channel between them. The trust center, Trent, who provides a quantum channel to link them by performing entanglement swapping, cannot eavesdrop on their communication. This protocol provides a high channel capacity because it uses hyperentanglement, which can be generated using a beta barium borate crystal.

关键词： quantum secure direct communication hyperentanglement

A Quantum Communication Protocol Transferring Unknown Photons Using Path-Polarization Hybrid Entanglement

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Chinese Physics Letters 2013年第4期30卷 5-9页

作者： jino heo Chang Ho Hong Jong In Lim Hyung Jin Yang Graduate School of Information Security Korea UniversityAnam 5-ga Sungbuk-guSeoulSouth Korea Center for Information Security Technologies(CIST) Korea UniversitySeoulSouth Korea Department of Physics Korea UniversityYunki-gun ChochiwonChoongnamSouth Korea

We propose a protocol for transferring photons of unknown states to a distant location using path-polarization hybrid entanglement.Our protocol uses a polarizing beam splitter(PBS),a beam splitter(BS),a CNOT-operation,four unitary operations and polarizing detectors.In our protocol,the hybrid entangled states are generated by the PBS,and it is transmitted through the quantum channel containing the BS and CNOT-gate.The measurement results of the polarizing detectors and classical communications determine which unitary operation will be used in the last step for recovering initial states.The security of the channel in transmitting unknown photons between two parties is confirmed by the results of the measurement of each target photon in the control mode.

关键词： unitary Polarization operations

Controlled mutual quantum entity authentication using entanglement swapping

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Chinese Physics B 2015年第9期24卷 116-124页

作者： Min-Sung Kang Chang-Ho Hong jino heo Jong-In Lim Hyung-Jin Yang Center for Information Security Technologies (CIST) Korea University Graduate School of Information Security Korea University Department of Physics Korea University

In this paper, we suggest a controlled mutual quantum entity authentication protocol by which two users mutually certify each other on a quantum network using a sequence of Greenberger–Horne–Zeilinger（GHZ）-like states. Unlike existing unidirectional quantum entity authentication, our protocol enables mutual quantum entity authentication utilizing entanglement swapping; moreover, it allows the managing trusted center（TC） or trusted third party（TTP） to effectively control the certification of two users using the nature of the GHZ-like state. We will also analyze the security of the protocol and quantum channel.

关键词： quantum authentication,quantum cryptography,quantum communication,GHZ-like state