Journal
APPLIED PHYSICS LETTERS
Volume 108, Issue 22, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4952772
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Funding
- ARO [W911NF-14-1-0079]
- National Science Foundation [1125844]
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We introduce and experimentally characterize a general purpose device for signal processing in circuit quantum electrodynamics systems. The device is a broadband two-port microwave circuit element with three modes of operation: it can transmit, reflect, or invert incident signals between 4 and 8 GHz. This property makes it a versatile tool for lossless signal processing at cryogenic temperatures. In particular, rapid switching (<= 15 ns) between these operation modes enables several multiplexing readout protocols for superconducting qubits. We report the device's performance in a two-channel code domain multiplexing demonstration. The multiplexed data are recovered with fast readout times (up to 400 ns) and infidelities <= 10(-2) for probe powers >= 7 fW, in agreement with the expectation for binary signaling with Gaussian noise. Published by AIP Publishing.
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