Propagation and Localization of Collective Excitations on a 24-Qubit Superconducting Processor

Ye, Yangsen; Ge, Zi-Yong; Wu, Yulin; Wang, Shiyu; Gong, Ming; Zhang, Yu-Ran; Zhu, Qing–Ling; Yang, Rui; Li, Shaowei; Liang, Futian; Lin, Jin; Xu, Yu; Guo, Cheng; Sun, Lihua; Cheng, Chen; Ma, Nvsen; Meng, Zi Yang; Deng, Hui; Rong, Hao; Lu, Chao‐Yang; Peng, Cheng-Zhi; Fan, Heng; Zhu, Xiaobo; Pan, Jian-Wei

doi:10.1103/physrevlett.123.050502

Cited by 121 publications

(91 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We believe that our results can be directly verified in various quantum simulators, especially in the superconducting quantum processor or Rydberg quantum simulators with ladder-type circuit architecture [47,67]. Here, we quantitatively clarify why the measurement of DE is quite efficient in comparison with (half-chain) EE.…”

Section: Summary and Discussionmentioning

confidence: 55%

“…Given the fact that the XY -type coupling can be easier realized on cold atoms [45,46], superconduction circuits [11,12,47], and trapped ions [61] than on Heisenberg interactions, we consider the X X -ladder model…”

Section: A Hamiltonianmentioning

confidence: 99%

“…In Sec. III, using the dynamics of DE we study the MBL transition, involving the transition points and scaling exponents, in X X -ladder model with quasiperiodic potential, which in principle can be realized in cold atoms [45,46] and superconducting circuits [47]. Discussions and conclusions are provided in Sec.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Characterizing the many-body localization transition by the dynamics of diagonal entropy

Sun

Cui

Fan

2020

Phys. Rev. Research

Self Cite

View full text Add to dashboard Cite

Based on the dynamics of diagonal entropy (DE), we provide a nonequilibrium method to study the properties of many-body localization (MBL) transition including the critical point and the universality class. By systematically studying the dynamical behaviors of DE in the fully explored Heisenberg spin chain with quasiperiodic field, we demonstrate the DE method can efficiently detect the transition point W c between the thermal and MBL phase. We further use the method to study the MBL transition in the isotropic X X-ladder model, showing W c ∼ 8.05. We also widely explore the X X-ladder model with various parameters. Our results indicate that the MBL transition in the Heisenberg model and the X X-ladder model belong to distinct universality classes according to the obvious difference between the scaling exponents. These results can be tested in ongoing quantum simulation experiments with larger qubit numbers, since the diagonal elements of the density matrix directly yielding the DE can be easily obtained by repeatedly running single-shot measurements.

show abstract

Section: Summary and Discussionmentioning

confidence: 55%

Section: A Hamiltonianmentioning

confidence: 99%

See 1 more Smart Citation

Characterizing the many-body localization transition by the dynamics of diagonal entropy

Sun

Cui

Fan

2020

Phys. Rev. Research

Self Cite

View full text Add to dashboard Cite

show abstract

“…Discussions and conclusions.-Recently, a ladder array with 24 superconducting artificial atoms has been experimentally demonstrated [95]. We find that even in small-size topological atom arrays realizable in current experiments, the collective edge states studied here can be observed.…”

mentioning

confidence: 48%

Topologically Protected Quantum Coherence in a Superatom

et al. 2020

View full text Add to dashboard Cite

Exploring the properties and applications of topological quantum states is essential to better understand topological matter. Here, we theoretically study a quasi-one-dimensional topological atom array. In the low-energy regime, the atom array is equivalent to a topological superatom. Driving the superatom in a cavity, we study the interaction between light and topological quantum states. We find that the edge states exhibit topology-protected quantum coherence, which can be characterized from the photon transmission. This quantum coherence helps us to find a superradiance-subradiance transition, and we also study its finite-size scaling behavior. The superradiance-subradiance transition also exists in symmetry-breaking systems. More importantly, it is shown that the quantum coherence of the subradiant edge state is robust to random noises, allowing the superatom to work as a topologically protected quantum memory. We suggest a relevant experiment with three-dimensional circuit QED. Our study may have applications in quantum computation and quantum optics based on topological edge states.

show abstract

“…6b shows the fidelity with our JPA turned on, we can see that our JPA improved the readout fidelity a lot. In the experiments on our superconducting qubit chips, up to 6 qubits can be read simultaneously with our JPA [29]. The large bandwidth with decent gain and saturation power is ideal for the readout task of our multi-qubits experiments.…”

Section: Qubit Readoutmentioning

confidence: 99%

Fabrication of the Impedance-Matched Josephson Parametric Amplifier and the Study of the Gain Profile

Yang

Deng

2020

IEEE Trans. Appl. Supercond.

Self Cite

View full text Add to dashboard Cite

We designed and fabricated an impedance matched Josephson junction parametric amplifier (JPA) working in the flux-pump mode for the broadband amplification of microwave signals. We developed a very simple fabrication method suitable for a small lab. We studied the phase response, as well as the gain, as a function of frequency and pump power at various pump frequencies. The phase response can be explained with the behavior of the non-linear Duffing oscillator. The observed decrease of the resonance frequency as the pump power increases, as well as the emergency of an unstable bifurcation zone, are the characteristic non-linear behavior of the Duffing oscillator. The gain profile in the stable zone can be explained with a model adapted from the theoretical model for the two-dimensional gain profile of an impedance-matched current-pumped JPA. With an appropriate environmental impedance, the theoretical model captures the features and morphology of the gain profile, such as the emergence of a gain hot zone with two branches around the resonance frequency of the JPA. Based on the gain profile, we propose that the best working zone is the merging point of the two branches of the gain hot zone before the emergence of the bifurcation zone, which gives a large bandwidth and a good gain. Over 17dB gain with a bandwidth larger than 300MHz was observed. The impedance matched JPA is used in our experiments for improving the fast readout fidelity of the transmon qubits.

show abstract

Propagation and Localization of Collective Excitations on a 24-Qubit Superconducting Processor

Cited by 121 publications

References 48 publications

Characterizing the many-body localization transition by the dynamics of diagonal entropy

Characterizing the many-body localization transition by the dynamics of diagonal entropy

Topologically Protected Quantum Coherence in a Superatom

Fabrication of the Impedance-Matched Josephson Parametric Amplifier and the Study of the Gain Profile

Contact Info

Product

Resources

About