共查询到20条相似文献,搜索用时 46 毫秒
1.
Min-Zhe Piao Hong-Fu Wang Xiao-Qiang Shao Xin Ji Shou Zhang 《International Journal of Theoretical Physics》2011,50(10):3033-3042
We propose an efficient scheme for preparing multi-qubit graph states via spin networks. The classical types of graph states including cluster state, Greenberger-Horne-Zeilinger state and circle-shaped states can be generated by using imaginary SWAP gate. Our method makes the generation of multipartite entangled graph states more efficient than the ones based on conventional controlled-NOT and controlled phase flip gate for solid-state devices. 相似文献
2.
L. B. Yu Z.-Y. Xue Z. D. Wang Y. Yu S. L. Zhu 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2011,61(2):499-505
The interaction between a superconducting phase qubit and
the two-level systems located inside the Josephson tunnel barrier
is described by the XY model, which is naturally used to
implement the i-SWAP gate. With this gate, we propose a scheme to
efficiently generate multi-qubit entangled states of such
two-level systems, including multipartite W state and cluster
states. In particular, it is found that, with the help of the phase
qubit, the entanglement witness can be used to efficiently detect
the produced multi-qubit entangled states. 相似文献
3.
4.
A design is proposed for scalable solid-state quantum computing, which is based on collectively enhanced magnetic coupling between nitrogen-vacancy center ensembles and superconducting transmission line resonators interconnected by current-biased Josephson junction superconducting phase qubit. In this hybrid system, we realize distant multi-qubit controlled phase gate operations and generate distant multi-qubit entangled W-like states, being indispensable resource to quantum computation. Our proposed architecture consists of solid-state spin ensembles and circuit QED, and could achieve quantum computing in a solid-state environment with high-fidelity and scalable way. The experimental feasibility is discussed, and the implementation efficiency is demonstrated numerically. 相似文献
5.
A design is proposed for scalable solid-state quantum computing, which is based on collectively enhanced magnetic coupling between nitrogen-vacancy center ensembles and superconducting transmission line resonators interconnected by current-biased Josephson junction superconducting phase qubit. In this hybrid system, we realize distant multi-qubit controlled phase gate operations and generate distant multi-qubit entangled W-like states, being indispensable resource to quantum computation. Our proposed architecture consists of solid-state spin ensembles and circuit QED, and could achieve quantum computing in a solid-state environment with high-fidelity and scalable way. The experimental feasibility is discussed, and the implementation efficiency is demonstrated numerically. 相似文献
6.
基于超导量子比特网络的Grover搜索算法实现方案(英文) 总被引:1,自引:1,他引:0
提出一个改进超导电路结构,此结构能实现量子计算所必需的任意两量子比特之间的长程作用,此结构能用目前技术制作.其次,基于此结构提出Grover搜索算法实现的物理方案.由于能实现任意两量子比特之间的控制相位门,所以多比特Grover搜索算法也能实现,从而满足各种量子计算的需要.此方案是一个基于电流控制的超导电荷比特网络结构的Grover搜索算法实现方案. 相似文献
7.
首先,提出了一个改进超导电路结构,此结构能实现任意两个量子比特的相互作用而非近邻作用,长程作用是实现量子计算所必需的,此结构能用目前的技术制作。其次,基于此结构提出了Grover搜索算法实现的物理方案。由于能实现任意两量子比特之间的控制相位门,所以多比特Grover搜索算法也能实现,以满足各种量子计算的需要。此方案是一个基于电流控制的超导电荷比特网络结构的可扩展及易实现的Grover搜索算法实现方案。 相似文献
8.
Wei Li Jinjing Shi Ronghua Shi Ying Guo 《International Journal of Theoretical Physics》2017,56(8):2579-2587
A novel blind quantum signature scheme based on cluster states is introduced. Cluster states are a type of multi-qubit entangled states and it is more immune to decoherence than other entangled states. The controlled four-particle cluster states are created by acting controlled-Z gate on particles of four-particle cluster states. The presented scheme utilizes the above entangled states and simplifies the measurement basis to generate and verify the signature. Security analysis demonstrates that the scheme is unconditional secure. It can be employed to E-commerce systems in quantum scenario. 相似文献
9.
Bidirectional transfer of quantum information for unknown photons via cross-Kerr nonlinearity and photon-number-resolving measurement
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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 measurement 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. 相似文献
10.
Ke-Hui Song Zhen-Gang ShiShao-Hua Xiang Xiong-Wen Chen 《Physica B: Condensed Matter》2012,407(17):3596-3599
Based on superconducting flux qubits coupled to a superconducting resonator. We propose a scheme for implementing multi-qubit controlled-NOT (C-NOT) gates and Greenberger–Horne–Zeilinger (GHZ) state with one flux qubit simultaneously controlling on n qubits. It is shown that the resonator mode is initially in the vacuum state, a high fidelity for operation procedure can be obtained. In addition, the gate operation time is independent of the number of the qubits, and can be controlled by adjusting detuning and coupling strengths. We also analyze the experimental feasibility that the conditions of the large detuning can be achieved by adjusting frequencies of the resonator and pulses. 相似文献
11.
Xiao-Qiang Shao Li Chen Shou Zhang Yong-Fang Zhao 《International Journal of Theoretical Physics》2009,48(10):2793-2799
A scheme for implementing a conditional z gate in the decoherence-free subspace of superconducting quantum-interference devices (SQUIDs) is presented based on the
dispersive interaction. Each logic qubit is encoded in the ground states of two rf SQUIDs, which own lower energy and can
be relatively stable in operation. By switching on/off the classical pulses and selecting the gating time appropriately, a
high fidelity is obtained. Moreover, this scheme can be generalized to the multi-qubit case without changing the gating time. 相似文献
12.
We investigate the local implementation of a nonlocal quantum Toffoli gate via partially entangled states. Firstly, we show
how the nonlocal Toffoli gate can be implemented with unit fidelity and a certain probability by employing two partially entangled
qubit pairs as quantum channels. The quantum circuit that does this proposed implementation is built entirely of local single-level
and two-level gates if the target node harness a three-level qudit as a catalyser. This enables the construction of this key
nonlocal quantum gate with existing technology. Then, we put forward a scheme to realize deterministic and exact implementation
of this nonlocal gate via more partially entangled pairs. In this scheme, the control nodes’ local positive operator valued
measurements (POVMs) lies at the heart. We construct the required POVMs. The fact that the deterministic and exact implementation
of a nonlocal multi-qubit gate could be realized by using partially entangled qubit pairs and comparatively fewer resources
cost is notable. 相似文献
13.
Dong Wang 《International Journal of Theoretical Physics》2010,49(4):777-785
Based on Wu et al.’s original idea (Phys. Lett. A 372:2802, 2008), we propose a scheme to remotely implement multi-qubit quantum phase gates. With the assistance of entanglement swapping,
classical communication and quantum repeater, multi-qubit quantum phase gates can be realized perfectly nearly. It is emphasized
that our proposal can overcome the limitation that error probability scales exponentially with the length of the channel during
the realization of the gates. 相似文献
14.
Based on superconducting charge qubits (SCCQs) coupled to a single-mode microwave cavity, we propose a scheme for generating charge cluster states. For all SCCQs, the controlled gate voltages are all in their degeneracy points, the quantum information is encoded in two logic states of charge basis. The generation of the multi-qubit cluster state can be achieved step by step on a pair of nearest-neighbor qubits. Considering effective long-rang coupling, we provide an efficient way to one-step generating of a highly entangled cluster state, in which the qubit-qubit coupling is mediated by the cavity mode. Our quantum operations are insensitive to the initial state of the cavity mode by removing the influence of the cavity mode via the periodical evolution of the system. Thus, our operation may be against the decoherence from the cavity. 相似文献
15.
Experimental Realization of Arbitrary Accuracy Iterative Phase Estimation Algorithms on Ensemble Quantum Computers
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We report the first experimental demonstration of a nuclear phase estimation algorithms. Using feedback and iterations, magnetic resonance (NMR) realization of iterative we experimentally obtain the phase with 6 bits of precision on a two-qubit NMR quantum computer. Furthermore, we experimentally demonstrate the effect of gate noise on the iterative phase estimation algorithm. Our experimental results show that errors of measurements of the phase depend strongly on the precision of coupling gates. This experiment can be used as a benchmark for multi-qubit realizations of quantum information processing and precision measurements. 相似文献
16.
A linear optical scheme for realizing the nondeterministic two-qubit quantum controlled phase gate is presented. The proposed setup involves a pair of product states, polarizing beam splitters, phase shifters and photon number resolving detectors. The omission of entangled ancilla input and additional single-qubit operations significantly reduces the complexity of this gate. This can be well implemented in experiment. 相似文献
17.
A multiple multi-qubit quantum states sharing scheme is proposed,in which the dealer can share multiple multi-qubit quantum states among the participants through only one distribution and one recovery.The dealer encodes the secret quantum states into a special entangled state,and then distributes the particles of the entangled state to the participants.The participants perform the single-particle measurements on their particles,and can cooperate to recover the multiple multi-qubit quantum states.Compared to the existing schemes,our scheme is more efficient and more flexible in practice. 相似文献
18.
Quantum controlled phase gate and cluster states
generation via two superconducting quantum interference devices in a
cavity 总被引:3,自引:0,他引:3
Z.-Y. Xue G. Zhang P. Dong Y.-M. Yi Z.-L. Cao 《The European Physical Journal B - Condensed Matter and Complex Systems》2006,52(3):333-336
A scheme for implementing 2-qubit quantum controlled phase gate (QCPG) is proposed with two superconducting quantum interference
devices (SQUIDs) in a cavity. The gate operations are
realized within the two lower flux states of the SQUIDs by using a quantized cavity field and classical microwave pulses.
Our scheme is achieved without any type of measurement, does not use the cavity mode as the data bus and only requires a very
short resonant interaction of the SQUID-cavity system. As an application of the QCPG operation, we also propose a scheme for
generating the cluster
states of many SQUIDs. 相似文献
19.
Z. J. Deng L.-M. Liang W. L. Yang 《International Journal of Theoretical Physics》2010,49(8):1904-1910
We propose a simple scheme to implement multi-qubit quantum Grover search with atomic ensembles by adiabatic passage. The
scheme is immune to the atomic spontaneous emission, cavity decay and fiber decay. Furthermore, the process can be speeded
up with atomic ensemble instead of single atom, which is important in view of decoherence. With each atomic ensemble confined
in an individual cavity, our scheme is experimentally scalable to multi-qubit cases. 相似文献
20.
Zhou Kaihang Shi Lei Luo Bingbing Xue Yang Huang Chao Ma Zhiqiang Wei Jiahua 《International Journal of Theoretical Physics》2019,58(12):4079-4092
By exploiting three-qubit entangled states and appropriate measurement basis, we propose efficient protocols for deterministic controlled remote state preparation of arbitrary real-parameter multi-qubit states, in which the maximal slice states are used as quantum channel. The successful probability of our schemes can reach up to 100% by using multi-qubit mutually orthogonal measurement basis without the introduction of auxiliary particles. Based on the implementation schemes for preparing arbitrary two- and three-qubit states with real parameters, we have derived the controlled remote state preparation protocols for arbitrary real-parameter multi-qubit states.
相似文献