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Multiplexed readout of transmon qubits with Josephson bifurcation amplifiers

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Academic year: 2021

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Figure 1: Readout of transmon qubits based on multiplexed JBAs. (a) Schematic electrical circuit
Figure 3: Simultaneous readout of the four qubits at a magnetic field such that ∆ 1−4 /2π = (−1.2, −1.76, −3.12, −2.06) GHz
Figure 5: Optical micrographs showing (a) the measured chip with four cells, (c) cell 1 with transmon B 1 and lumped ele-ment JBA R 1 , (b) the SQUID of B 1 , and (d) the Josephson junction inserted in R 1 .
Figure 6: Simultaneous readout of the four qubits at a magnetic field such that ∆ i /2π = (−1.2, −1.76, −3.12, −2.06) GHz

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