Journal
APPLIED PHYSICS LETTERS
Volume 114, Issue 17, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5089729
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Funding
- Department of Atomic Energy of the Government of India
- Department of Science and Technology, India, via the Ramanujan Fellowship
- Department of Science and Technology, India, via the Nano Mission
- Foundation Nanosciences de Grenoble
- Raman Charpak Fellowship
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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. Published under license by AIP Publishing.
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