Low-noise computer-controlled current source for quantum coherence experiments

S. Linzen; T. L. Robertson; T. Hime; B. L.T. Plourde; P. A. Reichardt; John Clarke

doi:10.1063/1.1771499

Low-noise computer-controlled current source for quantum coherence experiments

S. Linzen, T. L. Robertson, T. Hime, B. L.T. Plourde, P. A. Reichardt, John Clarke

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

A dual current source designed to provide static flux biases for a superconducting qubit and Superconducting QUantum Interference Device (SQUID) was analyzed. The source combined digitally programmable potentiometers with a stabilized voltage source. Each channel has maximum output of ∓1 mA and both current supplies are computer controlled. They were designed not to inject digital noise into the quantum bit and SQUID during manipulation and measurement of the flux. For a 275μA setting, the measured noise current was found 2.6 parts per million (ppm) rms in a bandwidth of 0.0017 Hz and by resetting the current in every 10 minutes the drift can be reduced to 5 ppm at a current of 750μA.

Original language	English (US)
Pages (from-to)	2541-2544
Number of pages	4
Journal	Review of Scientific Instruments
Volume	75
Issue number	8
DOIs	https://doi.org/10.1063/1.1771499
State	Published - Aug 2004
Externally published	Yes

ASJC Scopus subject areas

Instrumentation

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title = "Low-noise computer-controlled current source for quantum coherence experiments",

abstract = "A dual current source designed to provide static flux biases for a superconducting qubit and Superconducting QUantum Interference Device (SQUID) was analyzed. The source combined digitally programmable potentiometers with a stabilized voltage source. Each channel has maximum output of ∓1 mA and both current supplies are computer controlled. They were designed not to inject digital noise into the quantum bit and SQUID during manipulation and measurement of the flux. For a 275μA setting, the measured noise current was found 2.6 parts per million (ppm) rms in a bandwidth of 0.0017 Hz and by resetting the current in every 10 minutes the drift can be reduced to 5 ppm at a current of 750μA.",

author = "S. Linzen and Robertson, {T. L.} and T. Hime and Plourde, {B. L.T.} and Reichardt, {P. A.} and John Clarke",

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T1 - Low-noise computer-controlled current source for quantum coherence experiments

AU - Linzen, S.

AU - Robertson, T. L.

AU - Hime, T.

AU - Plourde, B. L.T.

AU - Reichardt, P. A.

AU - Clarke, John

PY - 2004/8

Y1 - 2004/8

N2 - A dual current source designed to provide static flux biases for a superconducting qubit and Superconducting QUantum Interference Device (SQUID) was analyzed. The source combined digitally programmable potentiometers with a stabilized voltage source. Each channel has maximum output of ∓1 mA and both current supplies are computer controlled. They were designed not to inject digital noise into the quantum bit and SQUID during manipulation and measurement of the flux. For a 275μA setting, the measured noise current was found 2.6 parts per million (ppm) rms in a bandwidth of 0.0017 Hz and by resetting the current in every 10 minutes the drift can be reduced to 5 ppm at a current of 750μA.

AB - A dual current source designed to provide static flux biases for a superconducting qubit and Superconducting QUantum Interference Device (SQUID) was analyzed. The source combined digitally programmable potentiometers with a stabilized voltage source. Each channel has maximum output of ∓1 mA and both current supplies are computer controlled. They were designed not to inject digital noise into the quantum bit and SQUID during manipulation and measurement of the flux. For a 275μA setting, the measured noise current was found 2.6 parts per million (ppm) rms in a bandwidth of 0.0017 Hz and by resetting the current in every 10 minutes the drift can be reduced to 5 ppm at a current of 750μA.

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Low-noise computer-controlled current source for quantum coherence experiments

Abstract

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