Proposals for experimentally realizing quantum-autonomous gates

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Abstract
Autonomous quantum machines (AQMs) execute tasks without requiring time-dependent external control. Motivations for AQMs include the restrictions imposed by classical control on quantum machines’ coherence times and geometries. Most AQM work is theoretical and abstract; yet an experiment recently demonstrated AQMs’ usefulness in qubit reset, crucial to quantum computing. To further reduce quantum computing’s classical control, we propose realizations of quantum-autonomous gates on three platforms: Rydberg atoms, trapped ions, and superconducting qubits. First, we show that a Rydberg-blockade interaction or an ultrafast transition can quantum-autonomously effect entangling gates on Rydberg atoms. Passive lasers control these gates quantum-autonomously. One can perform Z or entangling gates on trapped ions quantum-autonomously, by sculpting a linear Paul trap or leveraging a ring trap. Finally, circuit quantum electrodynamics can enable quantum-autonomous Z and XY gates on superconducting qubits. The gates can serve as building blocks for (fully or partially) quantum-autonomous circuits, which may reduce classical-control burdens.
Funding Information
  • European Commission (101080167)
  • National Science Foundation (OMA-2120757)
  • Wallenberg Center for Quantum Technology, Chalmers University of Technology
  • European Research Council (101041744 ESQuAT)
  • Knut och Alice Wallenbergs Stiftelse
  • National Institute of Standards and Technology (70NANB21H055 0)
  • Harvard Quantum Initiative Postdoctoral Fellowship in Science and Engineering
  • Bundesministerium Bildung
  • Austrian Research Promotion Agency (FO999914033)

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