Enhancing Dispersive Readout of Superconducting Qubits through Dynamic Control of the Dispersive Shift: Experiment and Theory
The performance of a wide range of quantum computing algorithms and protocols depends critically on the fidelity and speed of the employed qubit readout. Examples include gate sequences benefiting from midcircuit real-time measurement-based feedback, such as qubit initialization, entanglement genera...
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2024-11-01
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| Series: | PRX Quantum |
| Online Access: | http://doi.org/10.1103/PRXQuantum.5.040326 |
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| author | François Swiadek Ross Shillito Paul Magnard Ants Remm Christoph Hellings Nathan Lacroix Quentin Ficheux Dante Colao Zanuz Graham J. Norris Alexandre Blais Sebastian Krinner Andreas Wallraff |
| author_facet | François Swiadek Ross Shillito Paul Magnard Ants Remm Christoph Hellings Nathan Lacroix Quentin Ficheux Dante Colao Zanuz Graham J. Norris Alexandre Blais Sebastian Krinner Andreas Wallraff |
| author_sort | François Swiadek |
| collection | DOAJ |
| description | The performance of a wide range of quantum computing algorithms and protocols depends critically on the fidelity and speed of the employed qubit readout. Examples include gate sequences benefiting from midcircuit real-time measurement-based feedback, such as qubit initialization, entanglement generation, teleportation, and, perhaps most importantly, quantum error correction. A prominent and widely used readout approach is based on the dispersive interaction of a superconducting qubit strongly coupled to a large-bandwidth readout resonator, frequently combined with a dedicated or shared Purcell filter protecting qubits from decay. By dynamically reducing the qubit-resonator detuning and thus increasing the dispersive shift, we demonstrate a beyond-state-of-the-art two-state-readout error of only 0.25% in 100-ns integration time. Maintaining low-readout-drive strength, we nearly quadruple the signal-to-noise ratio of the readout by doubling the readout-mode line width, which we quantify by considering the hybridization of the readout resonator and its dedicated Purcell filter. We find excellent agreement between our experimental data and our theoretical model. The presented results are expected to further boost the performance of new and existing algorithms and protocols critically depending on high-fidelity fast midcircuit measurements. |
| format | Article |
| id | doaj-art-c10530e7d0a34438a82ec166a7c2440d |
| institution | Kabale University |
| issn | 2691-3399 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | PRX Quantum |
| spelling | doaj-art-c10530e7d0a34438a82ec166a7c2440d2024-11-20T15:11:20ZengAmerican Physical SocietyPRX Quantum2691-33992024-11-015404032610.1103/PRXQuantum.5.040326Enhancing Dispersive Readout of Superconducting Qubits through Dynamic Control of the Dispersive Shift: Experiment and TheoryFrançois SwiadekRoss ShillitoPaul MagnardAnts RemmChristoph HellingsNathan LacroixQuentin FicheuxDante Colao ZanuzGraham J. NorrisAlexandre BlaisSebastian KrinnerAndreas WallraffThe performance of a wide range of quantum computing algorithms and protocols depends critically on the fidelity and speed of the employed qubit readout. Examples include gate sequences benefiting from midcircuit real-time measurement-based feedback, such as qubit initialization, entanglement generation, teleportation, and, perhaps most importantly, quantum error correction. A prominent and widely used readout approach is based on the dispersive interaction of a superconducting qubit strongly coupled to a large-bandwidth readout resonator, frequently combined with a dedicated or shared Purcell filter protecting qubits from decay. By dynamically reducing the qubit-resonator detuning and thus increasing the dispersive shift, we demonstrate a beyond-state-of-the-art two-state-readout error of only 0.25% in 100-ns integration time. Maintaining low-readout-drive strength, we nearly quadruple the signal-to-noise ratio of the readout by doubling the readout-mode line width, which we quantify by considering the hybridization of the readout resonator and its dedicated Purcell filter. We find excellent agreement between our experimental data and our theoretical model. The presented results are expected to further boost the performance of new and existing algorithms and protocols critically depending on high-fidelity fast midcircuit measurements.http://doi.org/10.1103/PRXQuantum.5.040326 |
| spellingShingle | François Swiadek Ross Shillito Paul Magnard Ants Remm Christoph Hellings Nathan Lacroix Quentin Ficheux Dante Colao Zanuz Graham J. Norris Alexandre Blais Sebastian Krinner Andreas Wallraff Enhancing Dispersive Readout of Superconducting Qubits through Dynamic Control of the Dispersive Shift: Experiment and Theory PRX Quantum |
| title | Enhancing Dispersive Readout of Superconducting Qubits through Dynamic Control of the Dispersive Shift: Experiment and Theory |
| title_full | Enhancing Dispersive Readout of Superconducting Qubits through Dynamic Control of the Dispersive Shift: Experiment and Theory |
| title_fullStr | Enhancing Dispersive Readout of Superconducting Qubits through Dynamic Control of the Dispersive Shift: Experiment and Theory |
| title_full_unstemmed | Enhancing Dispersive Readout of Superconducting Qubits through Dynamic Control of the Dispersive Shift: Experiment and Theory |
| title_short | Enhancing Dispersive Readout of Superconducting Qubits through Dynamic Control of the Dispersive Shift: Experiment and Theory |
| title_sort | enhancing dispersive readout of superconducting qubits through dynamic control of the dispersive shift experiment and theory |
| url | http://doi.org/10.1103/PRXQuantum.5.040326 |
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