(Quantum Accelerator) Quantum Memories for Superconducting Quantum Networks
Abstract
Long-distance quantum communication requires small quantum processors that can exchange quantum information over long distances via optical photons. Superconducting qubits have recently become a leading platform for processing quantum information. However, their application in quantum communication is hindered by (i) the lack of an optical interface and (ii) the short qubit lifetimes that are not compatible with propagation delays in long-distance communication. Recent advances in quantum transduction from superconducting qubits to optical photons opened up the possibility of quantum communication networks based on superconducting quantum processor nodes. In this project, we will use acoustic engineering to realize long-lived quantum memories for quantum communication with this platform. At low temperatures, nanomechanical resonator and superconducting qubit lifetimes are limited by interactions with two-level systems (TLSs) via strain and electric fields. We will develop a new approach to enhance nanomechanical and superconducting qubit lifetimes via acoustic engineering of TLS properties. In our approach, we will realize quantum electromechanical devices on acoustic bandgap media where resonant phonon emission is forbidden. By suppressing the phonon emission of TLSs, we expect to enhance TLS lifetimes by several orders of magnitude. We will probe the lifetime and coherence of acoustically-engineered TLSs using microwave resonators fabricated on nanopatterned acoustic bandgap media. The use of high-impedance microwave resonators will allow strong coupling to individual TLSs and enable state readout for TLSs. Our results will improve our understanding of energy dissipation in quantum devices and provide strategies for realizing long-lived quantum memories for quantum communication based on TLSs, nanomechanical systems, and superconducting qubits.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jan 21, 2022
- Source ID
- FA95502110029XX0
Entities
People
- Alp Sipahigil
Organizations
- Air Force Office of Scientific Research
- United States Air Force
- University of California Regents