Minimizing the Discrimination Time for Quantum States of an Artificial Atom
| Autor: | Wolfgang Wernsdorfer, Farshad Foroughi, Nicolas Roch, Alexey V. Ustinov, Daria Gusenkova, Dennis Rieger, Ioan Pop, Luca Planat, Patrick Winkel, Martin Spiecker, Lukas Grünhaupt, Ivan Takmakov |
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| Rok vydání: | 2021 |
| Předmět: |
Physics
Superconductivity Quantum Physics Photon Physics::Instrumentation and Detectors Condensed Matter - Superconductivity Amplifier FOS: Physical sciences General Physics and Astronomy 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Superconductivity (cond-mat.supr-con) Resonator Circuit quantum electrodynamics Orders of magnitude (time) Quantum state Quantum mechanics 0103 physical sciences Quantum Physics (quant-ph) 010306 general physics 0210 nano-technology Quantum |
| Zdroj: | Physical Review Applied. 15 |
| ISSN: | 2331-7019 |
| DOI: | 10.1103/physrevapplied.15.064029 |
| Popis: | Fast discrimination between quantum states of superconducting artificial atoms is an important ingredient for quantum information processing. In circuit quantum electrodynamics, increasing the signal field amplitude in the readout resonator, dispersively coupled to the artificial atom, improves the signal-to-noise ratio and increases the measurement strength. Here we employ this effect over two orders of magnitude in readout power, made possible by the unique combination of a dimer Josephson junction array amplifier with a large dynamic range, and the fact that the readout of our granular aluminum fluxonium artificial atom remained quantum-non-demolition (QND) at relatively large photon numbers in the readout resonator, up to $\overline{n} = 110$. Using Bayesian inference, this allows us to detect quantum jumps faster than the readout resonator response time $2/\kappa$, where $\kappa$ is the bandwidth of the readout resonator. Comment: main text: 5 pages + 4 figures. appendices: 3 pages + 3 figures |
| Databáze: | OpenAIRE |
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