Minimizing the discrimination time for quantum states of an artificial atom

• URL: http://arxiv.org/abs/2011.08687v2
• Date: Wed, 18 Nov 2020 10:13:44 GMT
• Title: Minimizing the discrimination time for quantum states of an artificial atom
• Authors: Ivan Takmakov, Patrick Winkel, Farshad Foroughi, Luca Planat, Daria Gusenkova, Martin Spiecker, Dennis Rieger, Lukas Gr\"unhaupt, Alexey V. Ustinov, Wolfgang Wernsdorfer, Ioan M. Pop, Nicolas Roch
• Abstract summary: 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.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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.

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