共查询到20条相似文献,搜索用时 15 毫秒
1.
Quantum gates, which are the essential building blocks of quantum computers, are very fragile. Thus, to realize robust quantum gates with high fidelity is the ultimate goal of quantum manipulation. Here, we propose a nonadiabatic geometric quantum computation scheme on superconducting circuits to engineer arbitrary quantum gates, which share both the robust merit of geometric phases and the capacity to combine with optimal control technique to further enhance the gate robustness. Specifically, in our proposal, arbitrary geometric single-qubit gates can be realized on a transmon qubit, by a resonant microwave field driving, with both the amplitude and phase of the driving being timedependent. Meanwhile, nontrivial two-qubit geometric gates can be implemented by two capacitively coupled transmon qubits, with one of the transmon qubits’ frequency being modulated to obtain effective resonant coupling between them. Therefore, our scheme provides a promising step towards fault-tolerant solid-state quantum computation. 相似文献
2.
3.
4.
Yi‐Hao Kang Ye‐Hong Chen Zhi‐Cheng Shi Bi‐Hua Huang Jie Song Yan Xia 《Annalen der Physik》2019,531(7)
A protocol is proposed to realize one‐step implementation of the N‐qubit nonadiabatic holonomic quantum gates with superconducting qubits. The inverse Hamiltonian engineering is applied in designing microwave pulses to drive superconducting qubits. By combining curve fitting, the wave shapes of the designed pulses can be described by simple functions, which are not hard to realize in experiments. To demonstrate the effectiveness of the protocol, a three‐qubit holonomic controlled π‐phase gate is taken as an example in numerical simulations. The results show that the protocol holds robustness against noise and decoherence. Therefore, the protocol may provide an alternative approach for implementing N‐qubit nonadiabatic holonomic quantum gates. 相似文献
5.
A scheme to perfectly preserve an initial qubit state in
geometric quantum computation is proposed for a single-qubit geometric
quantum gate in a nuclear magnetic resonance system. At first, by
adjusting some magnetic field parameters, one can let the dynamic
phase be proportional to the geometric phase. Then, by controlling
the azimuthal angle in the initial state, we may realize a
geometric quantum gate whose fidelity is equal to one under
cyclic evolution. This means that the quantum information is no
distortion in the process of geometric quantum computation. 相似文献
6.
由于绝热条件几何相位量子逻辑门存在非绝热差错与退相干差错这一冲突,因此在拓扑量子计算中需要设计非绝热条件几何相门,以克服这一不足.证明螺旋光纤系统内光子有效哈密顿量恰好是一个Wang Matsumoto型哈密顿量,因此螺旋光纤系统能自动产生非绝热条件几何相移.同时还证明在螺旋光纤方案中,由极化光子与螺旋光纤相互作用哈密顿量所导致的动力学相位为零(这正是拓扑量子计算所要求的),以及在螺旋光纤系统中可以通过控制极化光子初始波矢,从而较容易获得条件初始态.总之,螺旋光纤系统方案能自动满足Wang与Matsumoto的核磁共振方案中为实现非绝热条件几何相移所提出的全部条件与要求.
关键词:
几何相位
螺旋光纤系统
Wang Matsumoto型哈密顿量
拓扑量子计算 相似文献
7.
Shuai Liu Jun-Hui Shen Ri-Hua Zheng Yi-Hao Kang Zhi-Cheng Shi Jie Song Yan Xia 《Frontiers of Physics》2022,17(2):21502
In this paper, we propose a scheme for implementing the nonadiabatic holonomic quantum computation (NHQC+) of two Rydberg atoms by using invariant-based reverse engineering (IBRE). The scheme is based on Förster resonance induced by strong dipole–dipole interaction between two Rydberg atoms, which provides a selective coupling mechanism to simply the dynamics of system. Moreover, for improving the fidelity of the scheme, the optimal control method is introduced to enhance the gate robustness against systematic errors. Numerical simulations show the scheme is robust against the random noise in control fields, the deviation of dipole–dipole interaction, the Förster defect, and the spontaneous emission of atoms. Therefore, the scheme may provide some useful perspectives for the realization of quantum computation with Rydberg atoms. 相似文献
8.
以周期驱动的量子Harper(quantum kicked Harper, QKH)模型为例,研究复杂量子动力系统的量子计算在各种干扰下的稳定性.通过对Floquet算子本征态的统计遍历性及其Husimi函数的分析,比较随机噪声干扰和静态干扰对量子计算不同程度的影响.进一步的保真度摄动分析表明,在随机噪声干扰下保真度随系统演化呈指数衰减,而静态干扰下的保真度为高斯衰减,并通过数值计算得到了干扰下的可信计算时间尺度.与经典混沌仿真中误差使状态产生指数分离不同,量子计算对状态干扰的稳定性和仿真模型的动力学特性无关.
关键词:
量子Harper模型
量子计算
量子混沌
保真度 相似文献
9.
Distributed quantum computation with superconducting qubit via LC circuit using dressed states 下载免费PDF全文
A scheme is proposed where two superconducting qubits driven by a classical field interacting separately with two distant LC circuits connected by another LC circuit through mutual inductance,are used for implementing quantum gates.By using dressed states,quantum state transfer and quantum entangling gate can be implemented.With the help of the time-dependent electromagnetic field,any two dressed qubits can be selectively coupled to the data bus (the last LC circuit),then quantum state can be transferred from one dressed qubit to another and multi-mode entangled state can also be formed.As a result,the promising perspectives for quantum information processing of mesoscopic superconducting qubits are obtained and the distributed and scalable quantum computation can be implemented in this scheme. 相似文献
10.
11.
We put forward an alternative quantum algorithm for finding Hamiltonian cycles in any N-vertex graph based on adiabatic quantum computing. With a von Neumann measurement on the final state, one may determine whether there is a Hamiltonian cycle in the graph and pick out a cycle if there is any. Although the proposed algorithm provides a quadratic speedup, it gives an alternative algorithm based on adiabatic quantum computation, which is of interest because of its inherent robustness. 相似文献
12.
A symmetric measure of quantum correlation based on the Hilbert-Schmidt distance is presented in this paper. For two-qubit states, we considerably simplify the optimization procedure so that numerical evaluation can be performed efficiently. Analytical expressions for the quantum correlation are attained for some special states. We further investigate the dynamics of quantum correlation of the system qubits in the presence of independent dissipative environments. Several nontrivial aspects are demonstrated. We find that the quantum correlation can increase even if the system state is suffering from dissipative noise. Sudden changes occur, even twice, in the time evolution of quantum correlation. There exists a certain correspondence between the evolution of quantum correlation in the systems and that in the environments, and the quantum correlation in the systems will be transferred into the environments completely and asymptotically. 相似文献
13.
运用量子轨迹和量子Monte Carlo仿真的方法,研究耗散退相干对周期驱动的量子Harper (quantum kicked Harper, QKH)模型量子计算的影响.数值仿真结果表明,一定强度的耗散干扰将破坏QKH特征状态的动态局域化以及相空间的随机网结构.以相位阻尼信道噪声模型为例分析了保真度的衰减规律以及可信计算时间尺度.与静态干扰相比,在干扰强度小于某一阈值时,耗散干扰下的可信计算时间尺度随量子比特的增加而快速下降;而在干扰强度大于该阈值时,静态干扰下的可信计算时间尺度下降更快. 相似文献
14.
运用量子轨迹和量子Monte Carlo仿真的方法,研究耗散退相干对周期驱动的量子Harper (quantum kicked Harper, QKH)模型量子计算的影响.数值仿真结果表明,一定强度的耗散干扰将破坏QKH特征状态的动态局域化以及相空间的随机网结构.以相位阻尼信道噪声模型为例分析了保真度的衰减规律以及可信计算时间尺度.与静态干扰相比,在干扰强度小于某一阈值时,耗散干扰下的可信计算时间尺度随量子比特的增加而快速下降;而在干扰强度大于该阈值时,静态干扰下的可信计算时间尺度下降更快.
关键词:
量子计算
量子Harper模型
主方程
量子Monte Carlo方法 相似文献
15.
1IntroductionThegeometricphaseplaysanimportantroleinunderstandingsomeoftheoutstandingenigmasofquantummechanics,andithaspaidmu... 相似文献
16.
利用绝热演化,文章提出一种新的方法以实现量子相位门.这种相位移动既非源于动力学过程,也非源于几何操纵.它来源于暗态本身的演化.基于绝热演化的优点,这种量子逻辑门对实验参量的起伏不敏感.与几何相位门相比,这种相位门更简单,并且保真度可得到进一步提高.文章对这种相位门做一简述. 相似文献
17.
利用绝热演化,文章提出一种新的方法以实现量子相位门,这种相位移动既非源于动力学过程,也非源于几何操纵,它来源于暗态本身的演化,基于绝热演化的优点,这种量子逻辑门对实验参量的起伏不敏感,与几何相位门相比,这种相位门更简单,并且保真度可得到进一步提高。文章对这种相位门做一简述。 相似文献
18.
D. Geberth O. Kern G. Alber I. Jex 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2008,46(2):381-394
Two possible applications of random decoupling are discussed.
Whereas so far decoupling methods have been considered merely for quantum memories,
here it is demonstrated that random decoupling is also a convenient tool for stabilizing quantum algorithms. Furthermore,
a decoupling scheme is presented which involves a random decoupling method
compatible with detected-jump error correcting quantum codes. With this combined error correcting strategy it is possible
to stabilize quantum information against both spontaneous decay and static imperfections of a qubit-based quantum information
processor in an efficient way. 相似文献
19.
Previous papers on the quantum wakefield around an ion moving in a dense plasma have considered the collision frequency in the static approximation. In this work, we present the results of the dynamically screened ion potential taking into account the dynamical electron–ion collision frequency. The Lenard–Balescu dynamical collision frequency and various approximations to it are considered. As a main result of our investigation for the subsonic, sonic, and supersonic regimes, we find that the frequency dependence of collisions can be safely discarded if the electronic streaming velocity (relative to an ion) is comparable to or less than the electronic Fermi velocity. 相似文献
20.
In this paper, the monogamy properties of some quantum correlations, including the geometric quantum discord, concurrence, entanglement of formation and entropy quantum discord, in the anisotropic spin-1/2 XY model with stag- gered Dzyaloshinskii-Moriya (DM) interaction have been investigated using the quantum renormalization group (QRG) method. We summarize the monogamy relation for different quantum correlation measures and make an explicit compar- ison. Through mathematical calculations and analysis, we obtain that no matter whether the QRG steps are carried out, the monogamy of the given states are always unaltered. Moreover, we conclude that the geometric quantum discord and concurrence obey the monogamy property while other quantum correlation measures, such as entanglement of formation and quantum discord, violate it for this given model. 相似文献