Single-Shot Readout of a Superconducting Qubit using a Josephson Parametric Oscillator
Journal Article - Open Access
MIT Lincoln Laboratory Lexington United States
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We propose and demonstrate a new read-out technique for a superconducting qubit by dispersivelycoupling it to a Josephson parametric oscillator. We employ a tunable quarter-wavelength super-conducting resonator and modulate its resonant frequency at twice its value with an amplitude sur-passing the threshold for parametric instability. We map the qubit states onto two distinct states ofclassical parametric oscillation one oscillating state, with 18515 photons in the resonator, and onewith zero oscillation amplitude. This high contrast obviates a following quantum-limited amplier.We demonstrate proof-of-principle, single-shot readout performance, and present an error budgetindicating that this method can surpass the delity threshold required for quantum computing.
- Quantum Theory and Relativity