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quantum public-key crypto via EPR pairs

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 58-63页

作者： Xiang-Qun Fu Hong-Wei Li Jian-Hong Shi Tan Li Wan-Su Bao Henan Key laboratory of quantum Information and Cryptography Information Engineering University Synergetic Innovation Center of quantum Information and quantum Physics University of Science and Technology of China

With the development of quantum computing technology, quantum public-key cryptography is gradually becoming an alternative to the existing classical public-key cryptography. This paper designs a quantum trapdoor one-way function via EPR pairs and quantum measurements. Based on this, a new quantum public-key cryptosystem is presented, which offers forward security,and can resist the chosen-plaintext attack and chosen-ciphertext attack. Compared with the existing quantum public-key cryptos,eavesdropping can be automatically detected in this new quantum public-key cryptosystem under a necessary condition, which is also detailed in the paper.

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quantum machine learning

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National Science Review 2019年第1期6卷 26-28页

作者： Jonathan Allcock Shengyu Zhang Tencent quantum laboratory

INTRODUCTION quantum machine learning is at the crossroads of two of the most exciting current areas of research:quantum computing and classical machine learning. Although the field is still in its infancy,the body of literature is already large enough to warrant several review articles [1–3]. This short survey focuses on a selection of significant recent results on the subtopic of quantum neural net-

关键词： RBM quantum machine learning

Speeding up transmissions of unknown quantum information along Ising-type quantum channels

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Chinese Physics B 2017年第1期26卷 125-130页

作者： W J Guo L F Wei quantum optoelectronics laboratory Southwest Jiaotong University Chengdu 610031 China State Key laboratory of Optoelectronic Materials and Technologies School of Physics Sun Yat-Sen University Guangzhou 510275 China

quantum teleportation with entanglement channels and a series of two-qubit SWAP gates between the nearestneighbor qubits are usually utilized to achieve the transfers of unknown quantum state from the sender to the distant receiver. In this paper, by simplifying the usual SWAP gates we propose an approach to speed up the transmissions of unknown quantum information, specifically including the single-qubit unknown state and two-qubit unknown entangled ones,by a series of entangling and disentangling operations between the remote qubits with distant interactions. The generic proposal is demonstrated specifically with experimentally-existing Ising-type quantum channels without transverse interaction; liquid NMR-molecules driven by global radio frequency electromagnetic pulses and capacitively-coupled Josephson circuits driven by local microwave pulses. The proposal should be particularly useful to set up the connections between the distant qubits in a chip of quantum computing.

关键词： unknown quantum information transfers Ising-type quantum chains NMR molecules superconducting circuits

quantum computation with surface-state electrons by rapid population passages

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Science China(Physics,Mechanics & Astronomy) 2014年第9期57卷 1718-1724页

作者： SHI Xuan WEI LianFu OH Choo Hiap quantum optoelectronics laboratory School of Physics and Technology Southwest Jiaotong University Centre for quantum Technologies and Department of Physics National University of Singapore State Key laboratory of Optoelectronic Materials and Technologies School of Physics Science and Engineering Sun Yet-sen University

quantum computation requires coherently controlling the evolutions of ***,these manipulations are implemented by precisely designing the durations(such as theπ-pulses)of the Rabi oscillations and tunable interbit *** this requirement,herein we show that the desired population transfers between the logic states can be deterministically realized(and thus quantum computation could be implemented)both adiabatically and non-adiabatically,by performing the duration-insensitive quantum *** proposal is specifically demonstrated with the surface-state of electrons floating on the liquid helium,but could also be applied to the other artificially controllable systems for quantum computing.

关键词： quantum computation surface-state electrons rapid population passages

Stark-Chirped Rapid Adiabatic Passage in Presence of Dissipation for quantum Computation

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Communications in Theoretical Physics 2014年第2期61卷 235-240页

作者：石轩 C.H.Oh 韦联福 quantum optoelectronics laboratory School of Physics and Technology Southwest Jiaotong University Centre for quantum Technologies and Department of Physics National University of Singapore State Key laboratory of Optoelectronic Materials and Technologies School of Physics Science and Engineering Sun Yet-sen University

Stark-chirped rapid adiabatic passage(SCRAP) is an important technique used for coherent quantum controls. In this paper we investigate how the practically-existing dissipation of the system influences on the efficiency of the passage, and thus the fidelities of the SCRAP-based quantum gates. With flux-biased Josephson qubits as a specifical example, our results show clearly that the efficiency of the logic gates implemented by SCRAP are robust against the weak dissipation. The influence due to the non-adiabtic transitions between the adiabatic passages is comparatively significantly small. Therefore, the SCRAP-based logic gates should be feasible for the realistic physical systems with noises.

关键词： adiabatic passage dissipation quantum computation

Influence of electron–phonon interaction on the properties of transport through double quantum dot with ferromagnetic leads

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Chinese Physics B 2014年第10期23卷 447-457页

作者：罗侃王发强梁瑞生任珍珍 laboratory of Nanophotonic Functional Materials and Devices (SIPSE) and Laboratory of Quantum Engineering and Quantum MaterialsSouth China Normal University

Electronic transport through a vibrating double quantum dot （DQD） in contact with noncollinear ferromagnetic （FM） leads is investigated. The state transition between the two dots of the DQD is excited by an AC microwave driving field. The corresponding currents and differential conductance are calculated in the Coulomb blockade regime by means of the Born-Markov master equation. It is shown that the interplay between electrons and phonons gives rise to phonon-assisted tunneling resonances and Franck-Condon blockade under certain conditions. In noncollinear magnetic configurations, spin-blockade effects are also observed, and the angle of polarization has some influence on the transport characteristics.

关键词： electron-phonon spin-polarized transport negative differential conductance

An autobias control system for the electro optic modulator used in a quantum key distribution system

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Chinese Physics B 2014年第8期23卷 261-268页

作者：陈文芬魏正军郭莉侯丽燕王赓王金东张智明郭建平刘颂豪 laboratory of Nanophotonic Functional Materials and Devices (SIPSE) and laboratory of quantum Engineering and quantum Materials South China Normal University

In a quantum key distribution system, it is crucial to keep the extinction ratio of the coherent pulses stable. This means that the direct current bias point of the electro-optic modulator （EOM） used for generating coherent pulses must be locked. In this paper, an autobias control system based on a lock-in-amplifier for the EOM is introduced. Its drift information extracting theory and control method are analyzed comprehensively. The long term drift of the extinction ratio of the coherent pulses is measured by a single photon detector, which indicates that the autobias control system is effective for stabilizing the bias point of the EOM.

关键词： quantum key distribution electro-optic modulator autobias control lock-in-amplifier

Realization of quantum permutation algorithm in high dimensional Hilbert space

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Chinese Physics B 2017年第6期26卷 42-46页

作者：陈东旭刘瑞丰张沛王云龙李宏荣高宏李福利 Key laboratory of quantum Information and quantum Optoelectronic Devices School of ScienceXi'an Jiaotong University Key laboratory of quantum Information University of Science and Technology of China

quantum algorithms provide a more efficient way to solve computational tasks than classical algorithms. We experimentally realize quantum permutation algorithm using light＇s orbital angular momentum degree of freedom. By exploiting the spatial mode of photons, our scheme provides a more elegant way to understand the principle of quantum permutation algorithm and shows that the high dimension characteristic of light＇s orbital angular momentum may be useful in quantum algorithms. Our scheme can be extended to higher dimension by introducing more spatial modes and it paves the way to trace the source of quantum speedup.

关键词： quantum permutation algorithm orbital angular momentum Fourier transformation

Adjustable quantum coherence effects in a hybrid optomechanical system

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Chinese Physics B 2017年第5期26卷 188-194页

作者：夏文清於亚飞张智明 Guangdong Provincial Key laboratory of Nanophotonic Functional Materials &(SIPSE) and Guangdong Provincial Key Laboratory of Quantum Engineering & Quantum Materials South China Normal University Guangdong Provincial Key laboratory of Nanophotonic Functional Materials &Devices(SIPSE) and Guangdong Provincial Key Laboratory of Quantum Engineering & Quantum Materials South China Normal University Guangdong Provincial Key laboratory of Nanophotonic Functional Materials & Devices(SIPSE) and Guangdong Provincial Key Laboratory of Quantum Engineering & Quantum Materials South China Normal University

We propose a system for achieving some adjustable quantum coherence effects, including the normal-mode splitting（NMS）, the optomechanically induced transparency（OMIT）, and the optomechanically induced absorption（OMIA）. In this system, two tunnel-coupled optomechanical cavities are each driven by a coupling field and coupled to an atomic ***, one of the cavities is also injected with a probe field. When the system works under different conditions, we can obtain the NMS, the OMIT, and the OMIA, respectively. These effects can be flexibly adjusted by the tunnel coupling between the two cavities, the power of the coupling lasers, and the coupling strength between the atomic ensembles and the cavity fields. Furthermore, we can realize the OMIT even if the oscillating mirrors have relatively larger decay rates.

关键词： coherence transparency ensemble mirrors decay Hamiltonian tunnel Langevin adjustable coherent