Entangling interactions between artificial atoms mediated by a multimode left-handed superconducting ring resonator

• URL: http://arxiv.org/abs/2307.15695v2
• Date: Sun, 12 May 2024 21:20:01 GMT
• Title: Entangling interactions between artificial atoms mediated by a multimode left-handed superconducting ring resonator
• Authors: T. McBroom-Carroll, A. Schlabes, X. Xu, J. Ku, B. Cole, S. Indrajeet, M. D. LaHaye, M. H. Ansari, B. L. T. Plourde,
• Abstract summary: We study a metamaterial transmission line formed into a ring and coupling it to qubits at different points around the ring. We observe significant variations in both of these inter-qubit interactions, including zero crossings and changes of sign. The ability to modulate interaction terms provides a promising pathway for implementing entangling gates in a system capable of hosting many qubits.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Superconducting metamaterial transmission lines implemented with lumped circuit elements can exhibit left-handed dispersion, where the group and phase velocity have opposite sign, in a frequency range relevant for superconducting artificial atoms. Forming such a metamaterial transmission line into a ring and coupling it to qubits at different points around the ring results in a multimode bus resonator with a compact footprint. Using flux-tunable qubits, we characterize and theoretically model the variation in the coupling strength between the two qubits and each of the ring resonator modes. Although the qubits have negligible direct coupling between them, their interactions with the multimode ring resonator result in both a transverse exchange coupling and a higher order $ZZ$ interaction between the qubits. As we vary the detuning between the qubits and their frequency relative to the ring resonator modes, we observe significant variations in both of these inter-qubit interactions, including zero crossings and changes of sign. The ability to modulate interaction terms such as the $ZZ$ scale between zero and large values for small changes in qubit frequency provides a promising pathway for implementing entangling gates in a system capable of hosting many qubits.

Related papers

• Collateral coupling between superconducting resonators: Fast and high fidelity generation of qudit-qudit entanglement [0.0]
  Superconducting circuits are highly controllable platforms to manipulate quantum states. We show how the existence of a distance-independent interaction between microwave resonators coupled capacitively through a qubit offers a new control parameter toward this goal.
  arXiv  Detail & Related papers  (2023-05-05T14:16:03Z)
• Control the qubit-qubit coupling in the superconducting circuit with double-resonator couplers [13.02901373376209]
  We propose a scheme of using two fixed frequency resonator couplers to tune the coupling strength between two Xmon qubits. The small direct qubit-quibt coupling could effectively suppress the frequency interval between switching off and switching on.
  arXiv  Detail & Related papers  (2023-04-20T02:00:38Z)
• Tuning long-range fermion-mediated interactions in cold-atom quantum simulators [68.8204255655161]
  Engineering long-range interactions in cold-atom quantum simulators can lead to exotic quantum many-body behavior. Here, we propose several tuning knobs, accessible in current experimental platforms, that allow to further control the range and shape of the mediated interactions.
  arXiv  Detail & Related papers  (2022-03-31T13:32:12Z)
• Frequency combs with parity-protected cross-correlations from dynamically modulated qubit arrays [117.44028458220427]
  We develop a general theoretical framework to dynamically engineer quantum correlations in the frequency-comb emission from an array of superconducting qubits in a waveguide. We demonstrate, that when the resonance of the two qubits are periodically modulated with a $pi$ phase shift, it is possible to realize simultaneous bunching and antibunching in cross-correlations of the scattered photons from different sidebands.
  arXiv  Detail & Related papers  (2022-03-01T13:12:45Z)
• Quantum dynamics of disordered arrays of interacting superconducting qubits: signatures of quantum collective states [0.0]
  We study theoretically the collective quantum dynamics occurring in superconducting qubits arrays. Even a weak interaction between qubits can overcome the disorder with a simultaneous formation of the collective excited states.
  arXiv  Detail & Related papers  (2021-11-29T17:35:43Z)
• Mediated interactions beyond the nearest neighbor in an array of superconducting qubits [0.0]
  We consider mediated interactions in an array of floating transmons, where each qubit capacitor consists of two superconducting pads galvanically isolated from ground. extraneous modes can generate coupling between the qubit modes that extends beyond the nearest neighbor.
  arXiv  Detail & Related papers  (2021-10-04T20:14:39Z)
• Superconducting coupler with exponentially large on-off ratio [68.8204255655161]
  Tunable two-qubit couplers offer an avenue to mitigate errors in multiqubit superconducting quantum processors. Most couplers operate in a narrow frequency band and target specific couplings, such as the spurious $ZZ$ interaction. We introduce a superconducting coupler that alleviates these limitations by suppressing all two-qubit interactions with an exponentially large on-off ratio.
  arXiv  Detail & Related papers  (2021-07-21T03:03:13Z)
• Hardware-Efficient Microwave-Activated Tunable Coupling Between Superconducting Qubits [0.0]
  We realize a tunable $ZZ$ interaction between two transmon qubits with fixed frequencies and fixed coupling. Because both transmons are driven, it is resilient to microwave crosstalk. We apply this interaction to implement a controlled phase (CZ) gate with a gate fidelity of $99.43(1)%$ as measured by cycle benchmarking.
  arXiv  Detail & Related papers  (2021-05-12T01:06:08Z)
• Waveguide Bandgap Engineering with an Array of Superconducting Qubits [101.18253437732933]
  We experimentally study a metamaterial made of eight superconducting transmon qubits with local frequency control. We observe the formation of super- and subradiant states, as well as the emergence of a polaritonic bandgap. The circuit of this work extends experiments with one and two qubits towards a full-blown quantum metamaterial.
  arXiv  Detail & Related papers  (2020-06-05T09:27:53Z)
• Universal non-adiabatic control of small-gap superconducting qubits [47.187609203210705]
  We introduce a superconducting composite qubit formed from two capacitively coupled transmon qubits. We control this low-frequency CQB using solely baseband pulses, non-adiabatic transitions, and coherent Landau-Zener interference. This work demonstrates that universal non-adiabatic control of low-frequency qubits is feasible using solely baseband pulses.
  arXiv  Detail & Related papers  (2020-03-29T22:48:34Z)
• Switching dynamics of single and coupled VO2-based oscillators as elements of neural networks [55.41644538483948]
  We report on the switching dynamics of both single and coupled VO2-based oscillators, with resistive and capacitive coupling, and explore the capability of their application in neural networks. For the resistive coupling, it is shown that synchronization takes place at a certain value of the coupling resistance, though it is unstable and a synchronization failure occurs periodically. For the capacitive coupling, two synchronization modes, with weak and strong coupling, are found. The transition between these modes is accompanied by chaotic oscillations.
  arXiv  Detail & Related papers  (2020-01-07T02:16:04Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.