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Seamless High-Q Microwave Cavities for Multimode Circuit Quantum Electrodynamics

Journal Article · · Physical Review Letters
 [1];  [2];  [3];  [2];  [2];  [2];  [4];  [2]
  1. Univ. of Chicago, IL (United States); Rutgers Univ., Piscataway, NJ (United States)
  2. Univ. of Chicago, IL (United States)
  3. Univ. of Chicago, IL (United States); Univ. of California, Berkeley, CA (United States)
  4. Samsung Electronics, Suwon (Korea, Republic of). Samsung Advanced Institute of Technology

Multimode cavity quantum electrodynamics ---where a two-level system interacts simultaneously with many cavity modes---provides a versatile framework for quantum information processing and quantum optics. Due to the combination of long coherence times and large interaction strengths, one of the leading experimental platforms for cavity QED involves coupling a superconducting circuit to a 3D microwave cavity. In this work, we realize a 3D multimode circuit QED system with single photon lifetimes of $$2$$ ms and cooperativities of $$0.5-1.5\times10^9$$ across 9 modes of a novel seamless cavity. We demonstrate a variety of protocols for universal single-mode quantum control applicable across all cavity modes, using only a single drive line. We achieve this by developing a straightforward flute method for creating monolithic superconducting microwave cavities that reduces loss while simultaneously allowing control of the mode spectrum and mode-qubit interaction. We highlight the flexibility and ease of implementation of this technique by using it to fabricate a variety of 3D cavity geometries, providing a template for engineering multimode quantum systems with exceptionally low dissipation. This work is an important step towards realizing hardware efficient random access quantum memories and processors, and for exploring quantum many-body physics with photons.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); Samsung Advanced Institute of Technology Global Research Partnership; National Science Foundation (NSF); Heising-Simons Foundation; David and Lucile Packard Foundation
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1818233
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 10 Vol. 127; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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