Minimizing the discrimination time for quantum states of an artificial atom
arXiv:2011.08687 · doi:10.1103/PhysRevApplied.15.064029
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 . Using Bayesian inference, this allows us to detect quantum jumps faster than the readout resonator response time , where is the bandwidth of the readout resonator.
arXiv commentmain text: 5 pages + 4 figures. appendices: 3 pages + 3 figures
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Cited by in corpus (8)
- Scalable High-Performance Fluxonium Quantum Processor
- Quantum non-demolition dispersive readout of a superconducting artificial atom using large photon numbers
- Granular Aluminum Parametric Amplifier for Low-Noise Measurements in Tesla Fields
- Microwave-activated gates between a fluxonium and a transmon qubit
- Offset Charge Dependence of Measurement-Induced Transitions in Transmons
- Practical Trainable Temporal Postprocessor for Multistate Quantum Measurement
- Pure kinetic inductance coupling for cQED with flux qubits
- Effects of the measurement power on states discrimination and dynamics in a circuit-QED experiment