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| 1 | Experimental demonstrations of high-Q superconducting coplanar waveguide resonators显示文摘We successfully designed and fabricated an absorption-type of superconducting coplanar waveguide (CPW) resonators. The resonators are made from a niobium film (about 160 nm thick) on a high-resistance Si substrate, and each resonator is fabricated as a meandered quarter-wavelength transmission line (one end is short to the ground and another end is capacitively coupled to a through feedline). With a vector network analyzer we measured the transmissions of the applied microwave through the resonators at ultra-low temperature. The obtained loaded quality factors are significantly high, i.e. up to ~10 6 . When the temperature increases slowly from the base temperature (20 mK), the resonance frequencies of the resonators are blue shifted and the quality factors are lowered slightly. In principle, this type of device can integrate a series of CPW resonators with a common feedline, making it a promising candidate as the data bus for coupling distant solid-state qubits and the sensitive detector of single photons. | LI HaiJie WANG YiWen WEI LianFu ZHOU PinJia WEI Qiang CAO ChunHai FANG YuRong YU Yang WU PeiHeng | 2013 | Chinese Science Bulletin2013，58，20： | 8 |
| 2 | Efficient generation of NOON states on two microwave-photon resonators显示文摘We present an efficient scheme for the generation of NOON states of photons in circuit QED assisted by a superconducting charge qutrit.It is completed with two kinds of manipulations,that is,the resonant operation on the qutrit and the resonator,and the single-qubit operation on the qutrit,and they both are high-fidelity operations.Compared with the one by a superconducting transmon qutrit proposed by Su et al.(Sci Rep 4:3898,2014),our scheme does not require to maintain the qutrit in the third excited state with a long time,which relaxes the difficulty of its implementation in experiment.Moreover,the level anharmonicity of a charge qutrit is larger and it is better for us to tune the different transitions of the charge qutrit resonant to the resonator,which makes our scheme faster than others. | Ming Hua Ming-Jie Tao Fu-Guo Deng | 2014 | Chinese Science Bulletin2014，59，23： | 0 |
| 3 | Dynamical Casimir effect in dissipative superconducting circuit system显示文摘We investigate the possibility of observing in integrated solid-state systems the dynamical Casimir effect,in which photons are created out of vacuum.We use a transmission line resonator on a superconducting chip as the microwave cavity and modulate its properties by coupling it to carefully designed Josephson devices.We evaluate the effect of main decoherence sources and show that our design offers a promising system for experimentally demonstrating the dynamical Casimir effect.Moreover,we also study the squeezing properties of the created photon field and how they depend on the dissipation. | ZHANG Yu Na LUO Xi Wang ZHOU Zheng Wei | 2014 | Science China(Physics,Mechanics & Astronomy)2014，57，12： | 0 |
| 4 | On the developments and applications of optical microcavities: an overview显示文摘Devices based on the optical microcavities which confne light to small volumes by resonant recirculation are already indispensable for a wide range of studies and applications.This article provides an overview of the development and application of optical microcavities.We frst give a pedagogical introduction to the interaction between a two-level system and a quantized electromagnetic feld in the cavity,based on the so-called Jaynes-Cummings model,which is basic and important theory model in the cavity quantum electrodynamics,and various quantum phenomena and applications of it.Then,we overview three basic types of the microcavity structures,and also highlight the progress achieved so far in these systems.Based on these three structures,we give an account of three representative applications of optical microcavities,and explain their microcavity requirements and the state of the art for these devices,before outlining the challenges for the future. | WANG TieJun CAO Cong WANG Chuan | 2013 | Science China(Information Sciences)2013，56，12： | 0 |
| 5 | Numerical approach for the evolution of spin-boson systems and its application to the Buck–Sukumar model显示文摘We study the evolution properties of spin-boson systems by a systematic numerical iteration approach,which performs well in the whole coupling regime.This approach evaluates a set of coefficients in the formal expression of the time-dependent Schr?dinger equation by expanding the initial state in Fock space.This set of coefficients is unique for the spin-boson Hamiltonian studied,allowing one to calculate the time evolution from different initial states.To complement our numerical calculations,we apply the method to the Buck–Sukumar model.We find that when the ground-state energy of the model is unbounded and no ground state exists in a certain parameter space,the time evolution of the physical quantities is naturally unstable. | Xue-Ying Liu Xue-Zao Ren Chen Wang Xian-Long Gao Ke-Lin Wang | 2020 | Communications in Theoretical Physics2020，72，6： | 0 |
| 6 | Photonic phase transition in circuit quantum electrodynamics lattices coupled to superconducting phase qubits显示文摘A hybrid quantum architecture was proposed to engineer a localization-delocalization phase transition of light in a two-dimension square lattices of superconducting coplanar waveguide resonators,which are interconnected by current-biased Josephson junction phase qubits.We find that the competition between the on-site repulsion and the nonlocal photonic hopping leads to the Mott insulator-superfluid transition.By using the mean-field approach and the quantum master equation,the phase boundary between these two different phases could be obtained when the dissipative effects of superconducting resonators and phase qubit are considered.The good tunability of the effective on-site repulsion and photon-hopping strengths enable quantum simulation on condensed matter physics and many-body models using such a superconducting resonator lattice system.The experimental feasibility is discussed using the currently available technology in the circuit QED. | LIU YiMin JIN WuYin YOU JiaBin | 2014 | Science China(Physics,Mechanics & Astronomy)2014，57，11： | 0 |
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