Directional emission of a readout resonator for qubit measurement
Robust and scalable multiplexed qubit readout is essential for realizing a fault-tolerant quantum computer. Conventional approaches rely on intentional mismatch of the feedline to provide directionality to the readout signal, at the cost of increased variation in resonator linewidth, which ultimately degrades quantum error correction. The authors address this challenge by demonstrating high-fidelity qubit readout using a readout resonator that emits photons preferentially toward the output, across its full bandwidth. By maintaining directional decay of the readout signal without intentional mismatch, this work presents a path toward the design of reliable, modular quantum processors.
Authors
- Kaidong Peng (ORCID: https://orcid.org/0000-0003-1270-0760)
- Yufeng Ye (ORCID: https://orcid.org/0000-0002-0555-9263)
- Michael Gingras (ORCID: https://orcid.org/0009-0006-5358-2181)
- Kevin P. O’Brien (ORCID: https://orcid.org/0000-0001-9213-6957)
- Kyle Serniak (ORCID: https://orcid.org/0000-0003-3469-9166)
- Mollie E. Schwartz (ORCID: https://orcid.org/0000-0003-4406-8974)
- Alec Yen (ORCID: https://orcid.org/0000-0003-2414-7624)
- Gregory Cunningham (ORCID: https://orcid.org/0009-0007-8066-1720)
- Hannah Stickler
- Bethany M. Niedzielski (ORCID: https://orcid.org/0000-0002-8277-8064)
- Jennifer Wang (ORCID: https://orcid.org/0000-0001-9659-7152)
Institutions
- Harvard University Press (US)
- MIT Lincoln Laboratory (US)
- Massachusetts Institute of Technology (US)
Publication Details
- Journal
- Physical Review Applied
- Published
- 2024-09-13
- DOI
- https://doi.org/10.1103/physrevapplied.22.034035
- Citations
- 5
- Primary Topic
- Quantum Information and Cryptography
- Type
- article
- Field-Weighted Citation Impact
- 1.74
Funders
- National Science Foundation
- International Business Machines Corporation
- Natural Sciences and Engineering Research Council of Canada