Qubit Measurement by Multichannel Driving
| Autor: | Leif Grönberg, Kuan Yen Tan, Matti Partanen, Mikko Möttönen, Aarne Keränen, Slawomir Simbierowicz, Visa Vesterinen, Jesper Ilves, Andras Gunyho, Dibyendu Hazra, Juha Hassel, Joni Ikonen, Jan Goetz |
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| Přispěvatelé: | Centre of Excellence in Quantum Technology, QTF, VTT Technical Research Centre of Finland, Quantum Computing and Devices, Department of Applied Physics, Aalto-yliopisto, Aalto University |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Vacuum state
FOS: Physical sciences General Physics and Astronomy 01 natural sciences Resonator Quantum measurement 0103 physical sciences quantum sensing 010306 general physics Quantum computer Physics Quantum Physics Observational error superconducting qubits ta114 quantum measurements Resonator mode quantum computation Quantum sensor qubit readout OtaNano qubit dynamics Qubit Quantum electrodynamics Superconducting qubit Quantum Physics (quant-ph) Ground state |
| Zdroj: | Ikonen, J, Goetz, J, Ilves, J, Keränen, A, Gunyho, A M, Partanen, M, Tan, K Y, Hazra, D, Grönberg, L, Vesterinen, V, Simbierowicz, S, Hassel, J & Möttönen, M 2019, ' Qubit Measurement by Multichannel Driving ', Physical Review Letters, vol. 122, no. 8, 080503 . https://doi.org/10.1103/PhysRevLett.122.080503 Physical Review Letters |
| DOI: | 10.1103/PhysRevLett.122.080503 |
| Popis: | We theoretically propose and experimentally implement a method of measuring a qubit by driving it close to the frequency of a dispersively coupled bosonic mode. The separation of the bosonic states corresponding to different qubit states begins essentially immediately at maximum rate, leading to a speedup in the measurement protocol. Also the bosonic mode can be simultaneously driven to optimize measurement speed and fidelity. We experimentally test this measurement protocol using a superconducting qubit coupled to a resonator mode. For a certain measurement time, we observe that the conventional dispersive readout yields close to 100% higher average measurement error than our protocol. Finally, we use an additional resonator drive to leave the resonator state to vacuum if the qubit is in the ground state during the measurement protocol. This suggests that the proposed measurement technique may become useful in unconditionally resetting the resonator to a vacuum state after the measurement pulse. Includes supplementary information |
| Databáze: | OpenAIRE |
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