Extensible circuit-QED architecture via amplitude- and frequency-variable microwaves

• URL: http://arxiv.org/abs/2204.08098v2
• Date: Tue, 19 Apr 2022 02:09:24 GMT
• Title: Extensible circuit-QED architecture via amplitude- and frequency-variable microwaves
• Authors: Agustin Di Paolo, Catherine Leroux, Thomas M. Hazard, Kyle Serniak, Simon Gustavsson, Alexandre Blais, William D. Oliver
• Abstract summary: We introduce a circuit-QED architecture combining fixed-frequency qubits and microwave-driven couplers. Drive parameters appear as tunable knobs enabling selective two-qubit coupling and coherent-error suppression.
• Score: 52.77024349608834
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We introduce a circuit-QED architecture combining fixed-frequency qubits and microwave-driven couplers. In the appropriate frame, the drive parameters appear as tunable knobs enabling selective two-qubit coupling and coherent-error suppression. We moreover introduce a set of controlled-phase gates based on drive-amplitude and drive-frequency modulation. We develop a theoretical framework based on Floquet theory to model microwave-activated interactions with time-dependent drive parameters, which we also use for pulse shaping. We perform numerical simulations of the gate fidelity for realistic circuit parameters, and discuss the impact of drive-induced decoherence. We estimate average gate fidelities beyond $99.9\%$ for all-microwave controlled-phase operations with gate times in the range $50-120\,\mathrm{ns}$. These two-qubit gates can operate over a large drive-frequency bandwidth and in a broad range of circuit parameters, thereby improving extensibility. We address the frequency allocation problem for this architecture using perturbation theory, demonstrating that qubit, coupler and drive frequencies can be chosen such that undesired static and driven interactions remain bounded in a multi-qubit device. Our numerical methods are useful for describing the time-evolution of driven systems in the adiabatic limit, and are applicable to a wide variety of circuit-QED setups.

Related papers

• Microwave-activated two-qubit gates for fixed-coupling and fixed-frequency transmon qubits [6.175888443499163]
  This study proposes a microwave-activated two-qubit gate scheme for two fixed-frequency transmon qubits coupled via a fixed-frequency transmon coupler. We show that the gate fidelity exceeding 0.999 can be achieved within 150 ns, excluding decoherence effects.
  arXiv  Detail & Related papers  (2024-10-10T11:04:34Z)
• Remote Entangling Gates for Spin Qubits in Quantum Dots using an Offset-Charge-Sensitive Transmon Coupler [0.2796197251957245]
  We propose a method to realize microwave-activated CZ gates between two remote spin qubits in quantum dots. The qubits are longitudinally coupled to the coupler, so that the transition frequency of the coupler depends on the logical qubit states. We develop non-Markovian time-domain simulations to accurately model gate performance in the presence of $1/fbeta$ charge noise.
  arXiv  Detail & Related papers  (2024-09-13T15:31:10Z)
• Function Approximation for Reinforcement Learning Controller for Energy from Spread Waves [69.9104427437916]
  Multi-generator Wave Energy Converters (WEC) must handle multiple simultaneous waves coming from different directions called spread waves. These complex devices need controllers with multiple objectives of energy capture efficiency, reduction of structural stress to limit maintenance, and proactive protection against high waves. In this paper, we explore different function approximations for the policy and critic networks in modeling the sequential nature of the system dynamics.
  arXiv  Detail & Related papers  (2024-04-17T02:04:10Z)
• Fast entangling quantum gates with almost-resonant modulated driving [7.663114782454964]
  off-resonant modulated driving (ORMD) with a special category of synthetic analytical pulses has improved the experimental performance of two- and multi-qubit gates. We design and analyze the entangling quantum gates via the almost-resonant driving (ARMD) method.
  arXiv  Detail & Related papers  (2024-02-09T16:16:58Z)
• Variational waveguide QED simulators [58.720142291102135]
  Waveguide QED simulators are made by quantum emitters interacting with one-dimensional photonic band-gap materials. Here, we demonstrate how these interactions can be a resource to develop more efficient variational quantum algorithms.
  arXiv  Detail & Related papers  (2023-02-03T18:55:08Z)
• Robust Oscillator-Mediated Phase Gates Driven by Low-Intensity Pulses [0.0]
  We present a method that leads to faster-than-dispersive entanglement gates with low-intensity pulses. Our method is applicable to any quantum platform that has qubits interacting with bosonic mediators via longitudinal coupling. We show that entanglement gates with infidelities of $10-3$ or $10-4$ are possible with current or near-future experimental setups.
  arXiv  Detail & Related papers  (2022-09-29T14:30:26Z)
• Accurate methods for the analysis of strong-drive effects in parametric gates [94.70553167084388]
  We show how to efficiently extract gate parameters using exact numerics and a perturbative analytical approach. We identify optimal regimes of operation for different types of gates including $i$SWAP, controlled-Z, and CNOT.
  arXiv  Detail & Related papers  (2021-07-06T02:02:54Z)
• Parametric-resonance entangling gates with a tunable coupler [0.0]
  We realize a parametric-resonance gate, which is activated by bringing the average frequency of the modulated qubit in resonance with a static-frequency qubit. We show that this approach is compatible with tunable coupler architectures, which reduce always-on residual couplings. The flexibility in activating parametric-resonance gates combined with a tunable coupler architecture provides a pathway for building large-scale quantum computers.
  arXiv  Detail & Related papers  (2021-04-08T05:00:20Z)
• Fast and differentiable simulation of driven quantum systems [58.720142291102135]
  We introduce a semi-analytic method based on the Dyson expansion that allows us to time-evolve driven quantum systems much faster than standard numerical methods. We show results of the optimization of a two-qubit gate using transmon qubits in the circuit QED architecture.
  arXiv  Detail & Related papers  (2020-12-16T21:43:38Z)
• Hardware-Encoding Grid States in a Non-Reciprocal Superconducting Circuit [62.997667081978825]
  We present a circuit design composed of a non-reciprocal device and Josephson junctions whose ground space is doubly degenerate and the ground states are approximate codewords of the Gottesman-Kitaev-Preskill (GKP) code. We find that the circuit is naturally protected against the common noise channels in superconducting circuits, such as charge and flux noise, implying that it can be used for passive quantum error correction.
  arXiv  Detail & Related papers  (2020-02-18T16:45:09Z)

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.