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Efficient scheme of quantum SWAP gate and multi-atom cluster state via cavity QED 被引量:1
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作者 姜春蕾 方卯发 胡要花 《Chinese Physics B》 SCIE EI CAS CSCD 2008年第1期190-193,共4页
In this paper, we propose a physical scheme to realize quantum SWAP gate by using a large-detuned single-mode cavity field and two identical Rydberg atoms. It is shown that the scheme can also be used to create multi-... In this paper, we propose a physical scheme to realize quantum SWAP gate by using a large-detuned single-mode cavity field and two identical Rydberg atoms. It is shown that the scheme can also be used to create multi-atom cluster state. During the interaction between atom and cavity, the cavity is only virtually excited and thus the scheme is insensitive to the cavity field states and cavity decay. With the help of our scheme it is very simple to prepare the N-atom cluster state with perfect fidelity and probability. The practical feasibility of this method is also discussed. 展开更多
关键词 cluster states swap gate cavity QED
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One-Step Realization of SWAP Gate with Superconducting Quantum-Interference Devices and Atoms in Cavity QED 被引量:1
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作者 ZHAN Zhi-Ming 《Communications in Theoretical Physics》 SCIE CAS CSCD 2008年第6期1603-1606,共4页
We put forward a simple scheme for one-step realization of a two-qubit SWAP gate with SQUIDs (superconducting quantum-interference devices) in cavity QED via Raman transition. In this scheme, the cavity field is onl... We put forward a simple scheme for one-step realization of a two-qubit SWAP gate with SQUIDs (superconducting quantum-interference devices) in cavity QED via Raman transition. In this scheme, the cavity field is only virtually excited and thus the cavity decay is suppressed. The SWAP gate is realized by using only two lower fiux states of the SQUID system and the excited state would not be excited. Therefore, the effect of decoherence caused from the levels of the SQUID system is possibly minimized. The scheme can also be used to implement the SWAP gate with atoms. 展开更多
关键词 swap gate SUPERCONDUCTING Raman transition
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Feasible schemes for quantum swap gates of optical qubits via cavity QED
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作者 唐世清 张登玉 +2 位作者 汪新文 谢利军 高峰 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第4期70-75,共6页
Feasible schemes for implementing quantum swap gates of both coherent-state qubits and photonic qubits are proposed using a A-type atomic ensemble trapped in a bimodal optical cavity. In both protocols, the decoherenc... Feasible schemes for implementing quantum swap gates of both coherent-state qubits and photonic qubits are proposed using a A-type atomic ensemble trapped in a bimodal optical cavity. In both protocols, the decoherence from atomic spontaneous emission is negligible due to the fact that the excited states of the atoms are adiabatically eliminated under large detuning condition and the swap gates can be created in a single step. In our schemes, the required atoms-cavity interaction time decreases with the increase of the number of atoms, which is very important in view of decoherence. The experimental feasibilities of the schemes are also discussed. 展开更多
关键词 swap gate coherent-state qubits photonic qubits FIDELITY
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Note on Implementation of Three-Qubit SWAP Gate
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作者 魏海瑞 狄尧民 +1 位作者 王艳 张洁 《Communications in Theoretical Physics》 SCIE CAS CSCD 2010年第1期78-82,共5页
In this paper, the synthesis and implementation of three-qubit SWAP gate is discussed. The three-qubit SWAP gate can be decomposed into product of 2 two-qubit SWAP gates, and it can be realized by 6 CNOT gates. Resear... In this paper, the synthesis and implementation of three-qubit SWAP gate is discussed. The three-qubit SWAP gate can be decomposed into product of 2 two-qubit SWAP gates, and it can be realized by 6 CNOT gates. Research illustrated that although the result is very simple, the current methods of matrix decomposition for multi-qubit gate can not get that. Then the implementation of three-qubit SWAP gate in the three spin system with Ising interaction is investigated and the sequence of control pulse and drift process to implement the gate is given. It needs 23 control pulses and 12 drift processes. Since the interaction can not be switched on and off at will, the realization of three-qubit SWAP gate in specific quantum system also can not simply come down to 2 two-qubit SWAP gates. 展开更多
关键词 three-qubit swap gate matrix decomposition three spin system Ising interaction
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Controllability of spin 1 systems and realization of ternary SWAP gate in two spin 1 systems coupled with Ising interaction
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作者 WANG Yan DI YaoMin WEI HaiRui 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2010年第10期1873-1877,共5页
In this paper,we investigate the controllability of spin 1 systems and the realization of ternary gates.Using dipole and quadrupole operators as the orthogonal basis of su(3) algebra,we discuss the controllability of ... In this paper,we investigate the controllability of spin 1 systems and the realization of ternary gates.Using dipole and quadrupole operators as the orthogonal basis of su(3) algebra,we discuss the controllability of one spin 1 systems and offer the concept of a complete set of control operators first.Then we present the controllability of two spin 1 systems coupled with Ising interaction and the transforming relations of the drift process of the system.Finally the specific realization of the ternary SWAP gate in these systems is discussed.It takes 9 drift processes and 25 basic control processes. 展开更多
关键词 CONTROLLABILITY spin 1 system ternary swap gate Ising interaction
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Deterministic implementations of fermionic quantum SWAP and Fredkin gates for spin qubits based on charge detection
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作者 王洪福 张寿 朱爱东 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第4期88-92,共5页
We propose a scheme to implement fermionic quantum SWAP and Fredkin gates for spin qubits with the aid of charge detection. The scheme is deterministic without the need of qubit qubit interaction, and the proposed set... We propose a scheme to implement fermionic quantum SWAP and Fredkin gates for spin qubits with the aid of charge detection. The scheme is deterministic without the need of qubit qubit interaction, and the proposed setups consist of simple polarizing beam splitters, single-spin rotations, and charge detectors. Compared with linear optics quantum computation, this charge-measurement-based qubit scheme greatly enhances the success probability for ira- plementing quantum SWAP and Fredkin gates and greatly simplifies the experimental realization of scalable quantum computers with noninteracting electrons. 展开更多
关键词 swap gate Fredkin gate charge detection
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Deterministic implementations of fermionic quantum SWAP and Fredkin gates for spin qubits based on charge detection
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作者 王洪福 张寿 朱爱东 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第4期92-96,共5页
We propose a scheme to implement fermionic quantum SWAP and Fredkin gates for spin qubits with the aid of charge detection. The scheme is deterministic without the need of qubit–qubit interaction, and the proposed se... We propose a scheme to implement fermionic quantum SWAP and Fredkin gates for spin qubits with the aid of charge detection. The scheme is deterministic without the need of qubit–qubit interaction, and the proposed setups consist of simple polarizing beam splitters, single-spin rotations, and charge detectors. Compared with linear optics quantum computation, this charge-measurement-based qubit scheme greatly enhances the success probability for im- plementing quantum SWAP and Fredkin gates and greatly simplifies the experimental realization of scalable quantum computers with noninteracting electrons. 展开更多
关键词 swap gate Fredkin gate charge detection
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Implementing remote controlled-NOT gates and entanglement swapping via geometric phase gates in ion-trap systems
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作者 杨榕灿 李洪才 +1 位作者 林秀 黄志平 《Chinese Physics B》 SCIE EI CAS CSCD 2008年第1期180-184,共5页
We propose a scheme for the implementation of remote controlled-NOT gates and entanglement swapping via geometric phase gates in ion-trap systems. The proposed scheme uses the two ground states of the A-type ions as m... We propose a scheme for the implementation of remote controlled-NOT gates and entanglement swapping via geometric phase gates in ion-trap systems. The proposed scheme uses the two ground states of the A-type ions as memory instead of the vibrational mode. And the system is robust against the spontaneous radiation and the dephasing. 展开更多
关键词 remote controlled-NOT gates entanglement swapping geometric phase gates ion-trap systems
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Three-Qutrit Topological SWAP Logic Gate for ISK(I=1,S=1,K=1)Spin System
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作者 Ozge Sahin Azmi Gencten 《Journal of Applied Mathematics and Physics》 2017年第12期2320-2325,共6页
Three Zeeman levels of spin-1 electron or nucleus are called as qutrits in quantum computation. Then, ISK (I = 1, S = 1, K = 1) spin system can be represented as three-qutrit states. Quantum circuits and algorithms co... Three Zeeman levels of spin-1 electron or nucleus are called as qutrits in quantum computation. Then, ISK (I = 1, S = 1, K = 1) spin system can be represented as three-qutrit states. Quantum circuits and algorithms consist of quantum logic gates. By using SWAP logic gate, two quantum states are exchanged. Topological quantum computing can be applied in quantum error correction. In this study, first, Yang-Baxter equation is modified for ISK (I = 1, S = 1, K = 1) spin system. Then three-qutrit topological SWAP logic gate is obtained. This SWAP logic gate is applied for three-qutrit states of ISK (I = 1, S = 1, K = 1) spin system. Three-qutrit SWAP logic gate is also applied to the product operators of ISK (I = 1, S = 1, K = 1) spin system. For these two applications, expected exchange results are found. 展开更多
关键词 Qutrits swap Logic gate Yang-Baxter Equation Product Operators
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Remote interactions between two d-dimensional distributed quantum systems: nonlocal generalized quantum control-NOT gate and entanglement swapping
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作者 陈立冰 路洪 金瑞博 《Chinese Physics B》 SCIE EI CAS CSCD 2007年第11期3204-3211,共8页
We present a systematic simple method to implement a generalized quantum control-NOT (CNOT) gate on two d-dimensional distributed systems. First, we show how the nonlocal generalized quantum CNOT gate can be impleme... We present a systematic simple method to implement a generalized quantum control-NOT (CNOT) gate on two d-dimensional distributed systems. First, we show how the nonlocal generalized quantum CNOT gate can be implemented with unity fidelity and unity probability by using a maximally entangled pair of qudits as a quantum channel. We also put forward a scheme for probabilistically implementing the nonlocal operation with unity fidelity by employing a partially entangled qudit pair as a quantum channel. Analysis of the scheme indicates that the use of partially entangled quantum channel for implementing the nonlocal generalized quantum CNOT gate leads to the problem of 'the general optimal information extraction'. We also point out that the nonlocal generalized quantum CNOT gate can be used in the entanglement swapping between particles belonging to distant users in a communication network and distributed quantum computer. 展开更多
关键词 nonlocal generalized quantum CNOT gate QUDIT partially entangled entanglement swapping
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Realization of Two-Qutrit Quantum Gates with Control Pulses 被引量:4
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作者 ZHANG Jie DI Yao-Min WEI Hai-Rui 《Communications in Theoretical Physics》 SCIE CAS CSCD 2009年第4期653-658,共6页
We investigate the realization of 2-qutrit logic gate in a bipartite 3-level system with qusi-Ising interaction. On the basis of Caftan decomposition of matrices, the unitary matrices of 2-qutrit are factorized into p... We investigate the realization of 2-qutrit logic gate in a bipartite 3-level system with qusi-Ising interaction. On the basis of Caftan decomposition of matrices, the unitary matrices of 2-qutrit are factorized into products of a series of realizable matrices. It is equivalent to exerting a certain control field on the system, and the control goal is usually gained by a sequence of control pulses. The general discussion on the realization of 2-qutrit logic gate is made first, and then the realization of the ternary SWAP gate and the ternary √SWAP gate are discussed specifically, and the sequences of control pulses and drift processes implementing these gates are given. 展开更多
关键词 Caftan decomposition 2-qutrit system ternary swap gate ternary swap gate
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实现量子SWAP门的腔QED方案(英文) 被引量:1
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作者 何娟 叶柳 倪致祥 《量子电子学报》 CAS CSCD 北大核心 2007年第5期579-582,共4页
提出一个基于两个三能级原子和单膜腔场大失谐相互作用来实现两比特量子SWAP门的腔QED方案。在这个方案里,两个全同三能级原子同时与单膜真空腔场发生大失谐相互作用,并辅助了经典场对原子施行单比特操作。此外,在整个作用过程中,腔场... 提出一个基于两个三能级原子和单膜腔场大失谐相互作用来实现两比特量子SWAP门的腔QED方案。在这个方案里,两个全同三能级原子同时与单膜真空腔场发生大失谐相互作用,并辅助了经典场对原子施行单比特操作。此外,在整个作用过程中,腔场态一直处于虚激发,原子和腔场之间没有信息交换,因此对腔的品质要求大大降低。在目前的腔QED技术条件下,该方案是可以实现的。 展开更多
关键词 量子信息 量子swap 腔QED 大失谐
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One scheme for remote quantum logical gates with the assistance of a classical field 被引量:2
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作者 李艳玲 方卯发 曾可 《Chinese Physics B》 SCIE EI CAS CSCD 2010年第1期61-65,共5页
A scheme, based on the two two-level atoms resonantly driven by the classical field separately trapped in two cavities coupled by an optical fibre, for the implementation of remote two-qubit gates is investigated. It ... A scheme, based on the two two-level atoms resonantly driven by the classical field separately trapped in two cavities coupled by an optical fibre, for the implementation of remote two-qubit gates is investigated. It is found that the quantum controlled-phase and swap gates can be achieved with the assistance of the classical field when there are detunings of the coupling quantum fields. Moreover, the influence of the dissipation of the cavities and the optical fibre is analysed while the spontaneous emission of the atoms can be effectively suppressed by introducing A-type atoms. 展开更多
关键词 quantum entanglement remote phase gate remote swap gate
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Quantum logic gates with two-level trapped ions beyond Lamb-Dicke limit 被引量:1
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作者 郑小娟 罗益民 蔡建武 《Chinese Physics B》 SCIE EI CAS CSCD 2009年第4期1352-1356,共5页
In the system with two two-level ions confined in a linear trap, this paper presents a simple scheme to realize the quantum phase gate (QPG) and the swap gate beyond the Lamb Dicke (LD) limit. These two-qubit quan... In the system with two two-level ions confined in a linear trap, this paper presents a simple scheme to realize the quantum phase gate (QPG) and the swap gate beyond the Lamb Dicke (LD) limit. These two-qubit quantum logic gates only involve the internal states of two trapped ions. The scheme does not use the vibrational mode as the data bus and only requires a single resonant interaction of the ions with the lasers. Neither the LD approximation nor the auxiliary atomic level is needed in the proposed scheme. Thus the scheme is simple and the interaction time is very short, which is important in view of decoherence. The experimental feasibility for achieving this scheme is also discussed. 展开更多
关键词 trapped ions quantum phase gate swap gate beyond the Lamb Dicke limit
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Swap量子门的消相干特性(英文)
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作者 高峰 张登玉 +2 位作者 刘雅丽 周熠 刘超平 《衡阳师范学院学报》 2007年第3期47-50,共4页
利用单电子量子点的自旋态,研究了Swap量子门的量子相干特性。得到了系统的超算子,并利用超算子得出了体系的密度矩阵元,在玻恩和马尔科夫近似下,分析了体系由于磁环境所引起的消相干特性。
关键词 消相干 swap量子门 量子点 矩阵元
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Quantum state swap for two trapped Rydberg atoms
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作者 吴怀志 杨贞标 郑仕标 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第4期82-87,共6页
The quantum swap gate is one of the most useful gates for quantum computation. Two-qubit entanglement and a controlled-NOT quantum gate in a neutral Rydberg atom system have been achieved in recent experiments. It is ... The quantum swap gate is one of the most useful gates for quantum computation. Two-qubit entanglement and a controlled-NOT quantum gate in a neutral Rydberg atom system have been achieved in recent experiments. It is therefore very interesting to propose a scheme here for swapping a quantum state between two trapped neutral atoms via the Rydberg blockade mechanism. The atoms interact with a sequence of laser pulses without individual addressing. The errors of the swap gate due to imprecision of pulse length, finite Rydberg interaction, and atomic spontaneous emission are discussed. 展开更多
关键词 neutral atom swap gate Rydberg blockade
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在离子阱中实现量子SWAP门的方案(英文)
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作者 胡桂玉 杨振 叶柳 《量子电子学报》 CAS CSCD 北大核心 2009年第5期555-559,共5页
提出了一个利用处在线性阱中的两个全同的三能级离子与两个不同频率的激光脉冲共振相互作用来实现两比特量子SWAP门的方案,该方案是根据Haffner和Riebe等的实验方法与结果选择^(40)Ca^+离子S_(1/2)基态的一个塞曼能级作为基态,以亚稳态D... 提出了一个利用处在线性阱中的两个全同的三能级离子与两个不同频率的激光脉冲共振相互作用来实现两比特量子SWAP门的方案,该方案是根据Haffner和Riebe等的实验方法与结果选择^(40)Ca^+离子S_(1/2)基态的一个塞曼能级作为基态,以亚稳态D_(5/2)的两个塞曼能级作为两个激发态来实现的,选择适当的参数如质心模的频率v=1.2 MHz,拉比频率Ω=0.1v以及Lamb-Dicke参数η=0.1,计算出实现该方案所用的总时间为T≈1.3×10^(-3)s,该时间远小于亚稳态D_(5/2)的寿命T_1≈1.16s,并且在这个方案里消相干是可以被忽略的。在目前的离子阱技术条件下,该方案是可以实现的。 展开更多
关键词 量子光学 量子swap 离子阱 共振
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基于魔方旋转方法的量子彩色图像加密方案 被引量:1
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作者 姜东焕 王华堃 徐光宝 《北京工业大学学报》 CAS CSCD 北大核心 2023年第6期656-666,共11页
为实现彩色图像安全高效加密,基于魔方旋转方法构建了一种量子图像置乱方案,并且设计出了对应的量子线路.结合量子异或(exclusive OR,XOR)操作和量子交换操作,实现了一种以量子魔方旋转图像置乱为基础的量子彩色图像加密方案,并对该加... 为实现彩色图像安全高效加密,基于魔方旋转方法构建了一种量子图像置乱方案,并且设计出了对应的量子线路.结合量子异或(exclusive OR,XOR)操作和量子交换操作,实现了一种以量子魔方旋转图像置乱为基础的量子彩色图像加密方案,并对该加密方案进行了全部量子线路设计与仿真实验,取得了良好的加密结果.该加密方案的算法复杂度相对于其经典算法有指数级加速. 展开更多
关键词 量子图像加密 魔方旋转 量子异或(exclusive OR XOR)操作 量子交换操作 量子门 位平面
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腔场QED与量子点系统激子纠缠态的制备及消纠缠研究(英文)
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作者 向少华 施振刚 宋克慧 《量子光学学报》 CSCD 北大核心 2007年第3期177-181,共5页
利用量子点与单模腔场共振相互作用模型提出了激子Bell类和W类纠缠态的制备方案。借助于超算符方法和态的保真度考察了所制备的激子纠缠态的消相干特性,结果表明:激子Bell类和W态的纠缠特性非常脆弱,在极短的时间里演变为消纠缠态。基... 利用量子点与单模腔场共振相互作用模型提出了激子Bell类和W类纠缠态的制备方案。借助于超算符方法和态的保真度考察了所制备的激子纠缠态的消相干特性,结果表明:激子Bell类和W态的纠缠特性非常脆弱,在极短的时间里演变为消纠缠态。基于腔场与两量子点共振相互作用模型设计了一个量子交换门。 展开更多
关键词 激子纠缠态 腔场QED 量子交换门 消相干效应
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基于腔QED实现相干腔场远程控制非门和纠缠交换
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作者 陈翔 杨榕灿 +1 位作者 李洪才 郑世才 《福建师范大学学报(自然科学版)》 CAS CSCD 北大核心 2008年第6期47-50,73,共5页
提出一种利用原子和腔场的控制非门实现相干态腔场远程控制非门和无Bell基测量的纠缠交换的新方案,该方案是基于Ξ型三能级原子与相干态腔场的非共振相互作用.在作用过程中,腔场和原子没有交换能量,这有效抑制了腔场的消相干效应,并且... 提出一种利用原子和腔场的控制非门实现相干态腔场远程控制非门和无Bell基测量的纠缠交换的新方案,该方案是基于Ξ型三能级原子与相干态腔场的非共振相互作用.在作用过程中,腔场和原子没有交换能量,这有效抑制了腔场的消相干效应,并且根据当前的腔QED技术,该方案是有可能实现的. 展开更多
关键词 远程控制非门 纠缠交换 腔QED
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