Frequency Multiplexing for Readout of Spin Qubits

2013/12/18 by J. M. Hornibrook, J. I. Colless, A. C. Mahoney +5 · 2 citations
Physics and Astronomy · #cond-mat.mes-hall

paper · pdf · doi:10.1063/1.4868107

published as Applied Physics Letters 104, 103108, (2014)

arxiv created 2013/12/18 · arxiv updated 2015/09/24

Abstract

We demonstrate a low loss, chip-level frequency multiplexing scheme for readout of scaled-up spin qubit devices. By integrating separate bias tees and resonator circuits on-chip for each readout channel, we realize dispersive gate-sensing in combination with charge detection based on two rf quantum point contacts (rf-QPCs). We apply this approach to perform multiplexed readout of a double quantum dot in the few-electron regime, and further demonstrate operation of a 10-channel multiplexing device. Limitations for scaling spin qubit readout to large numbers of multiplexed channels is discussed.

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• A foundry-fabricated spin qubit unit cell with in-situ dispersive readout
• HI-HCQC: A Tightly-Coupled Hardware Interface with High-Efficiency Communication for Hybrid Classical-Quantum Computing

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