Distinguishing Coherent and Thermal Photon Noise in a Circuit Quantum Electrodynamical System
In the cavity-QED architecture, photon number fluctuations from residual cavity photons cause qubit dephasing due to the ac Stark effect. These unwanted photons originate from a variety of sources, such as thermal radiation, leftover measurement photons, and cross talk. Using a capacitively shunted...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2018
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| Online Access: | http://hdl.handle.net/1721.1/116815 https://orcid.org/0000-0002-4674-2806 https://orcid.org/0000-0002-8553-3353 https://orcid.org/0000-0002-4436-6886 https://orcid.org/0000-0002-7069-1025 https://orcid.org/0000-0001-8041-0824 |
| _version_ | 1826211555099803648 |
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| author | Yan, Fei Campbell, Daniel Lawrence Krantz, Philip Johan Erik Kjaergaard, Morten Kim, David M. Yoder, Jonilyn Longenecker Hover, David J. Sears, Adam P. Kerman, Andrew J Orlando, Terry Philip Gustavsson, Simon Oliver, William D |
| author2 | Lincoln Laboratory |
| author_facet | Lincoln Laboratory Yan, Fei Campbell, Daniel Lawrence Krantz, Philip Johan Erik Kjaergaard, Morten Kim, David M. Yoder, Jonilyn Longenecker Hover, David J. Sears, Adam P. Kerman, Andrew J Orlando, Terry Philip Gustavsson, Simon Oliver, William D |
| author_sort | Yan, Fei |
| collection | MIT |
| description | In the cavity-QED architecture, photon number fluctuations from residual cavity photons cause qubit dephasing due to the ac Stark effect. These unwanted photons originate from a variety of sources, such as thermal radiation, leftover measurement photons, and cross talk. Using a capacitively shunted flux qubit coupled to a transmission line cavity, we demonstrate a method that identifies and distinguishes coherent and thermal photons based on noise-spectral reconstruction from time-domain spin-locking relaxometry. Using these measurements, we attribute the limiting dephasing source in our system to thermal photons rather than coherent photons. By improving the cryogenic attenuation on lines leading to the cavity, we successfully suppress residual thermal photons and achieve T₁-limited spin-echo decay time. The spin-locking noise-spectroscopy technique allows broad frequency access and readily applies to other qubit modalities for identifying general asymmetric nonclassical noise spectra. |
| first_indexed | 2024-09-23T15:07:51Z |
| format | Article |
| id | mit-1721.1/116815 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T15:07:51Z |
| publishDate | 2018 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/1168152022-10-02T00:48:17Z Distinguishing Coherent and Thermal Photon Noise in a Circuit Quantum Electrodynamical System Yan, Fei Campbell, Daniel Lawrence Krantz, Philip Johan Erik Kjaergaard, Morten Kim, David M. Yoder, Jonilyn Longenecker Hover, David J. Sears, Adam P. Kerman, Andrew J Orlando, Terry Philip Gustavsson, Simon Oliver, William D Lincoln Laboratory Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Research Laboratory of Electronics Yan, Fei Campbell, Daniel Lawrence Krantz, Philip Johan Erik Kjaergaard, Morten Kim, David M. Yoder, Jonilyn Longenecker Hover, David J. Sears, Adam P. Kerman, Andrew J Orlando, Terry Philip Gustavsson, Simon Oliver, William D In the cavity-QED architecture, photon number fluctuations from residual cavity photons cause qubit dephasing due to the ac Stark effect. These unwanted photons originate from a variety of sources, such as thermal radiation, leftover measurement photons, and cross talk. Using a capacitively shunted flux qubit coupled to a transmission line cavity, we demonstrate a method that identifies and distinguishes coherent and thermal photons based on noise-spectral reconstruction from time-domain spin-locking relaxometry. Using these measurements, we attribute the limiting dephasing source in our system to thermal photons rather than coherent photons. By improving the cryogenic attenuation on lines leading to the cavity, we successfully suppress residual thermal photons and achieve T₁-limited spin-echo decay time. The spin-locking noise-spectroscopy technique allows broad frequency access and readily applies to other qubit modalities for identifying general asymmetric nonclassical noise spectra. United States. Army Research Office (Grant W911NF-14-1-0682) United States. Air Force Office of Scientific Research (Contract FA8721-05-C-0002) National Science Foundation (U.S.) (Grant PHY-1415514) 2018-07-06T13:52:20Z 2018-07-06T13:52:20Z 2018-06 2018-01 2018-06-29T18:00:19Z Article http://purl.org/eprint/type/JournalArticle 0031-9007 1079-7114 http://hdl.handle.net/1721.1/116815 Yan, Fei et al. "Distinguishing Coherent and Thermal Photon Noise in a Circuit Quantum Electrodynamical System." Physical Review Letters 120, 26 (June 2018): 260504 © 2018 American Physical Society https://orcid.org/0000-0002-4674-2806 https://orcid.org/0000-0002-8553-3353 https://orcid.org/0000-0002-4436-6886 https://orcid.org/0000-0002-7069-1025 https://orcid.org/0000-0001-8041-0824 en http://dx.doi.org/10.1103/PhysRevLett.120.260504 Physical Review Letters Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. American Physical Society application/pdf American Physical Society American Physical Society |
| spellingShingle | Yan, Fei Campbell, Daniel Lawrence Krantz, Philip Johan Erik Kjaergaard, Morten Kim, David M. Yoder, Jonilyn Longenecker Hover, David J. Sears, Adam P. Kerman, Andrew J Orlando, Terry Philip Gustavsson, Simon Oliver, William D Distinguishing Coherent and Thermal Photon Noise in a Circuit Quantum Electrodynamical System |
| title | Distinguishing Coherent and Thermal Photon Noise in a Circuit Quantum Electrodynamical System |
| title_full | Distinguishing Coherent and Thermal Photon Noise in a Circuit Quantum Electrodynamical System |
| title_fullStr | Distinguishing Coherent and Thermal Photon Noise in a Circuit Quantum Electrodynamical System |
| title_full_unstemmed | Distinguishing Coherent and Thermal Photon Noise in a Circuit Quantum Electrodynamical System |
| title_short | Distinguishing Coherent and Thermal Photon Noise in a Circuit Quantum Electrodynamical System |
| title_sort | distinguishing coherent and thermal photon noise in a circuit quantum electrodynamical system |
| url | http://hdl.handle.net/1721.1/116815 https://orcid.org/0000-0002-4674-2806 https://orcid.org/0000-0002-8553-3353 https://orcid.org/0000-0002-4436-6886 https://orcid.org/0000-0002-7069-1025 https://orcid.org/0000-0001-8041-0824 |
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