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1.
赵娜  刘建设  李铁夫  陈炜 《物理学报》2013,62(1):10301-010301
超导量子比特以其在可控性、低损耗以及可扩展性等方面的优势被认为是最有希望实现量子计算机的固态方式之一.量子比特之间的相干可控耦合是实现大规模的量子计算的必要条件.本文介绍了超导量子比特耦合方式的研究进展,包括利用电容或电感实现量子比特的局域耦合,着重介绍一维传输线谐振腔作为量子总线实现多个量子比特的可控耦合的电路量子电动力学体系,并对最新的三维腔与超导量子比特的耦合结构的研究进展进行了论述.对各种耦合体系的哈密顿量进行了比较详细的分析,并按照局域性和可控性对不同耦合机制进行了分类.  相似文献   

2.
介观互感耦合阻尼并联双谐振电路的量子涨落   总被引:5,自引:1,他引:4  
对介观互感耦合阻尼并联电路作双模耦合阻尼谐振子处理,将其量子化.通过三次幺正变换,将体系的哈密顿量对角化.在此基础上给出了体系的本征能谱,研究了Fock态、真空态下各回路电流和电压的量子涨落.  相似文献   

3.
介观多环耦合系统中的量子电流增强效应   总被引:18,自引:0,他引:18       下载免费PDF全文
崔元顺 《物理学报》2005,54(4):1799-1803
基于电荷具有离散性的事实对介观电路进行量子化,以介观三环为例研究多环耦合系统中的量子电流增强效应.结果表明,量子电流增强效应不仅存在于耦合双环系统中,而且在金属多环系统中也存在. 关键词: 介观电路 耦合系统 量子电流 增强效应  相似文献   

4.
平移压缩Fock态下无耗散介观电感耦合电路的量子效应   总被引:3,自引:2,他引:1  
研究了在平移压缩Fock态下介观电感耦合电路中电荷和电流的量子涨落.结果表明:每个回路中电荷、电流的量子涨落只依赖于两回路的器件参量和压缩参量,而与平移参量无关.  相似文献   

5.
Here we propose a hybrid quantum circuit for achieving the quantum controlled-not (CNOT) gate operation on a photon-spin hybrid state. The hybrid quantum circuit consists of a nitrogen-vacancy (N-V) center and microtoroidal resonator coupling system, and a single photon waveguide. We implement the complete Bell state analysis using the proposed circuit. This proposed hybrid quantum circuit could enable a high fidelity of qubit manipulation and allows the feasible with the current experimental technologies.  相似文献   

6.
We have realized a tunable coupling over a large frequency range between an asymmetric Cooper pair transistor (charge qubit) and a dc SQUID (phase qubit). Our circuit enables the independent manipulation of the quantum states of each qubit as well as their entanglement. The measurement of the charge qubit's quantum states is performed by an adiabatic quantum transfer from the charge to the phase qubit. The measured coupling strength is in agreement with an analytic theory including a capacitive and a tunable Josephson coupling between the two qubits.  相似文献   

7.
Quantum Fluctuations in a Mesoscopic Inductance Coupling Circuit   总被引:9,自引:0,他引:9  
Starting from the equation of motion of a mesoscopic inductance coupling circuit,the quantum fluctuations of charge and current in the circuit are investigated inboth the eigenstates of the system and the squeezed vacuum state. The resultsshow that there exist quantum fluctuations of the charge and current in bothcases, and the fluctuations in each component circuit are connected.  相似文献   

8.
《Comptes Rendus Physique》2012,13(5):470-479
We review the use of mechanical oscillators in circuit quantum electrodynamics. The capacitive coupling of nano-electromechanical systems with quantum bits and superconducting microwave resonators gives rise to a rich quantum physics involving electrons, photons and phonons. We focus in particular on the linear coupling between a mechanical oscillator and a microwave resonator and present the quantum dynamics that stems from the phonotonic Josephson junction. The microwave cavity turns out to be a powerful device to detect quantum phonon states and manipulate entangled states between phonons and photons.  相似文献   

9.
王继锁  冯健  詹明生 《物理学报》2001,50(2):299-303
基于介观电路中电荷应是量子化的这一基本事实,给出了介观电感耦合电路的量子理论和库仑阻塞条件,并讨论了该介观电感耦合电路的量子涨落. 关键词: 介观电路 电感耦合 电荷的不连续性 库仑阻塞 量子涨落  相似文献   

10.
In the Born-Markov approximation and two-level approximation, and using the Bloch-Redfield equation, the decoherence property of superconducting quantum circuit with a flux qubit is investigated. The influence ou decoherence of the mutual inductance coupling between the circuit components is complicated. The mutual inductance coupling between different loops will decrease the decoherence time. However, the mutual inductance coupling of the same loop, in a certain interval, will increase the decoherence time. Therefore, we can control the decoherence time by changing the mutual inductance parameters such as the strength and direction of coupling.  相似文献   

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