Coherent oscillations in a superconducting multi-level quantum system
J. Claudon, F. Balestro, F. W. J. Hekking, and O. Buisson
TL;DR
This paper reports the observation of coherent oscillations in a multi-level superconducting quantum system, demonstrating control over multiple quantum states using microwave pulses and flux-based measurement techniques.
Contribution
It introduces a method to observe and manipulate multiple quantum states in a superconducting system, expanding the understanding of multi-level quantum coherence.
Findings
Coherent oscillations observed in a multi-level superconducting system
Number of participating states increases with microwave power
Quantum states are read out via flux pulse projection
Abstract
We have observed coherent time evolution of states in a multi-level quantum system, formed by a current-biased dc SQUID. The manipulation of the quantum states is achieved by resonant microwave pulses of flux. The number of quantum states participating in the coherent oscillations increases with increasing microwave power. Quantum measurement is performed by a nanosecond flux pulse which projects the final state onto one of two different voltage states of the dc SQUID, which can be read out.
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