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Single-shot qubit readout in circuit Quantum Electrodynamics

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Academic year: 2021

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Figure 1: Principle of a single-shot readout for a transmon qubit. A transmon (magenta) is capacitively coupled to a coplanar resonator (green grayed strips) made anharmonic by inserting a Josephson junction (green cross) at its center
Figure 2: Best single-shot visibity obtained at ∆ = 0.38 GHz and f C − f = 17 MHz. (a) S-curves p B (P S ) obtained with the qubit prepared in state | 0 i , | 1 i , or | 2 i (solid lines S f 0 , S f 1 and S f 2 , respectively) with the proper resonant π pu
Figure 3: Effect of the readout process onto the qubit at ∆ = 0.25 GHz and f C − f = 25 MHz
Figure 4: Trade-off between qubit coherence and readout fidelity. (a) Experimental re- re-laxation time T 1 (red dots) and dephasing time T φ (violet dots) of the qubit as a function of f 01

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