Multiplexed readout of four qubits in 3D circuit QED architecture using a broadband Josephson parametric amplifier

Kundu, Suman ; Gheeraert, Nicolas ; Hazra, Sumeru ; Roy, Tanay ; Salunkhe, Kishor V. ; Patankar, Meghan P. ; Vijay, R. (2019) Multiplexed readout of four qubits in 3D circuit QED architecture using a broadband Josephson parametric amplifier Applied Physics Letters, 114 (17). ISSN 0003-6951

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Official URL: https://doi.org/10.1063/1.5089729

Related URL: http://dx.doi.org/10.1063/1.5089729

Abstract

We propose and demonstrate a frequency-multiplexed readout scheme in 3D circuit-quantum electrodynamics (cQED) architecture. We use four transmon qubits coupled to individual rectangular cavities which are aperture-coupled to a common rectangular waveguide feedline. A coaxial to waveguide transformer at the other end of the feedline allows one to launch and collect the multiplexed signal. The reflected readout signal is amplified by an impedance-engineered broadband parametric amplifier with 380 MHz bandwidth. This provides us high fidelity single-shot readout of multiple qubits using compact microwave circuitry, an efficient way for scaling up to more qubits in 3D cQED.

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Deposited On:21 Aug 2025 09:51
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