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arXiv · 1312.5064

Frequency Multiplexing for Readout of Spin Qubits

J. M. Hornibrook·J. I. Colless·A. C. Mahoney·X. G. Croot·S. Blanvillain·H. Lu·A. C. Gossard·D. J. Reilly
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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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J. M. Hornibrook, J. I. Colless, A. C. Mahoney, X. G. Croot, S. Blanvillain, H. Lu, A. C. Gossard, D. J. Reilly. 2013-12-18. Frequency Multiplexing for Readout of Spin Qubits. https://doi.org/10.1063/1.4868107

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