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Hardware-Efficient Quantum Random Access Memory with Hybrid Quantum Acoustic Systems.

Connor T Hann1, Chang-Ling Zou2, Yaxing Zhang1

  • 1Departments of Applied Physics and Physics, Yale University, New Haven, Connecticut 06511, USA.

Physical Review Letters
|January 11, 2020
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Summary
This summary is machine-generated.

We propose a new quantum computing scheme using hybrid quantum systems. This approach enables a hardware-efficient quantum random access memory (QRAM) using acoustic resonators and superconducting qubits.

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Area of Science:

  • Quantum Computing
  • Quantum Information Science
  • Solid State Physics

Background:

  • Hybrid quantum systems combining acoustic resonators and superconducting qubits show promise for quantum information processing.
  • Acoustic modes offer high quality factors and small mode volumes, making them suitable for quantum memories.
  • Qubit-phonon coupling facilitates quantum state initialization and manipulation.

Purpose of the Study:

  • To present a novel scheme for quantum computing utilizing multimode quantum acoustic systems.
  • To propose a hardware-efficient implementation of a quantum random access memory (QRAM) based on this scheme.
  • To leverage engineered phonon-phonon couplings for efficient quantum data access.

Main Methods:

  • Storing quantum information in high-quality factor (high-Q) phonon modes.
  • Engineering inter-mode couplings via off-resonant drives applied to a transmon qubit.
  • Utilizing engineered phonon-phonon couplings to access data in superposition based on address mode states.

Main Results:

  • A scheme for quantum computing with multimode quantum acoustic systems is presented.
  • A hardware-efficient QRAM implementation is proposed using acoustic resonators and superconducting qubits.
  • The proposed scheme offers potential improvements in gate fidelity for long-lived acoustic modes compared to existing methods.

Conclusions:

  • The engineered phonon-phonon couplings enable efficient QRAM functionality on a single chip.
  • This approach provides a promising pathway for developing advanced quantum memories and processors.
  • The integration of acoustic resonators and superconducting qubits offers a scalable solution for quantum information storage and retrieval.