Fast and High-Fidelity State Preparation and Measurement in Triple-Quantum-Dot Spin Qubits
We demonstrate rapid high-fidelity state preparation and measurement in exchange-only Si/SiGe triple-quantum-dot qubits. Fast measurement integration (980-ns) and initialization (approximately 300-ns) operations are performed with all-electrical baseband control. We emphasize a leakage-sensitive joi...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2022-03-01
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| Series: | PRX Quantum |
| Online Access: | http://doi.org/10.1103/PRXQuantum.3.010352 |
| _version_ | 1818775145382150144 |
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| author | Jacob Z. Blumoff Andrew S. Pan Tyler E. Keating Reed W. Andrews David W. Barnes Teresa L. Brecht Edward T. Croke Larken E. Euliss Jacob A. Fast Clayton A.C. Jackson Aaron M. Jones Joseph Kerckhoff Robert K. Lanza Kate Raach Bryan J. Thomas Roland Velunta Aaron J. Weinstein Thaddeus D. Ladd Kevin Eng Matthew G. Borselli Andrew T. Hunter Matthew T. Rakher |
| author_facet | Jacob Z. Blumoff Andrew S. Pan Tyler E. Keating Reed W. Andrews David W. Barnes Teresa L. Brecht Edward T. Croke Larken E. Euliss Jacob A. Fast Clayton A.C. Jackson Aaron M. Jones Joseph Kerckhoff Robert K. Lanza Kate Raach Bryan J. Thomas Roland Velunta Aaron J. Weinstein Thaddeus D. Ladd Kevin Eng Matthew G. Borselli Andrew T. Hunter Matthew T. Rakher |
| author_sort | Jacob Z. Blumoff |
| collection | DOAJ |
| description | We demonstrate rapid high-fidelity state preparation and measurement in exchange-only Si/SiGe triple-quantum-dot qubits. Fast measurement integration (980-ns) and initialization (approximately 300-ns) operations are performed with all-electrical baseband control. We emphasize a leakage-sensitive joint initialization and measurement metric, developed in the context of exchange-only qubits but applicable more broadly, and report an infidelity of 2.5±0.5×10^{−3}. This result is enabled by a high-valley-splitting heterostructure, initialization at the two- to three-electron charge boundary, and careful assessment and mitigation of T_{1} during spin-to-charge conversion. The ultimate fidelity is limited by a number of comparably important factors and we identify clear paths toward further improved fidelity and speed. Along with an observed single-qubit randomized benchmarking error rate of 1.7×10^{−3}, this work demonstrates initialization, control, and measurement of Si/SiGe triple-dot qubits at fidelities and durations that are promising for scalable quantum information processing. |
| first_indexed | 2024-12-18T10:52:23Z |
| format | Article |
| id | doaj.art-bab5ef18724c408596be63e678c0c143 |
| institution | Directory Open Access Journal |
| issn | 2691-3399 |
| language | English |
| last_indexed | 2024-12-18T10:52:23Z |
| publishDate | 2022-03-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | PRX Quantum |
| spelling | doaj.art-bab5ef18724c408596be63e678c0c1432022-12-21T21:10:24ZengAmerican Physical SocietyPRX Quantum2691-33992022-03-013101035210.1103/PRXQuantum.3.010352Fast and High-Fidelity State Preparation and Measurement in Triple-Quantum-Dot Spin QubitsJacob Z. BlumoffAndrew S. PanTyler E. KeatingReed W. AndrewsDavid W. BarnesTeresa L. BrechtEdward T. CrokeLarken E. EulissJacob A. FastClayton A.C. JacksonAaron M. JonesJoseph KerckhoffRobert K. LanzaKate RaachBryan J. ThomasRoland VeluntaAaron J. WeinsteinThaddeus D. LaddKevin EngMatthew G. BorselliAndrew T. HunterMatthew T. RakherWe demonstrate rapid high-fidelity state preparation and measurement in exchange-only Si/SiGe triple-quantum-dot qubits. Fast measurement integration (980-ns) and initialization (approximately 300-ns) operations are performed with all-electrical baseband control. We emphasize a leakage-sensitive joint initialization and measurement metric, developed in the context of exchange-only qubits but applicable more broadly, and report an infidelity of 2.5±0.5×10^{−3}. This result is enabled by a high-valley-splitting heterostructure, initialization at the two- to three-electron charge boundary, and careful assessment and mitigation of T_{1} during spin-to-charge conversion. The ultimate fidelity is limited by a number of comparably important factors and we identify clear paths toward further improved fidelity and speed. Along with an observed single-qubit randomized benchmarking error rate of 1.7×10^{−3}, this work demonstrates initialization, control, and measurement of Si/SiGe triple-dot qubits at fidelities and durations that are promising for scalable quantum information processing.http://doi.org/10.1103/PRXQuantum.3.010352 |
| spellingShingle | Jacob Z. Blumoff Andrew S. Pan Tyler E. Keating Reed W. Andrews David W. Barnes Teresa L. Brecht Edward T. Croke Larken E. Euliss Jacob A. Fast Clayton A.C. Jackson Aaron M. Jones Joseph Kerckhoff Robert K. Lanza Kate Raach Bryan J. Thomas Roland Velunta Aaron J. Weinstein Thaddeus D. Ladd Kevin Eng Matthew G. Borselli Andrew T. Hunter Matthew T. Rakher Fast and High-Fidelity State Preparation and Measurement in Triple-Quantum-Dot Spin Qubits PRX Quantum |
| title | Fast and High-Fidelity State Preparation and Measurement in Triple-Quantum-Dot Spin Qubits |
| title_full | Fast and High-Fidelity State Preparation and Measurement in Triple-Quantum-Dot Spin Qubits |
| title_fullStr | Fast and High-Fidelity State Preparation and Measurement in Triple-Quantum-Dot Spin Qubits |
| title_full_unstemmed | Fast and High-Fidelity State Preparation and Measurement in Triple-Quantum-Dot Spin Qubits |
| title_short | Fast and High-Fidelity State Preparation and Measurement in Triple-Quantum-Dot Spin Qubits |
| title_sort | fast and high fidelity state preparation and measurement in triple quantum dot spin qubits |
| url | http://doi.org/10.1103/PRXQuantum.3.010352 |
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