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The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...
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Fast Gate-Based Readout of Silicon Quantum Dots Using Josephson Parametric Amplification.

S Schaal1, I Ahmed2, J A Haigh3

  • 1London Centre for Nanotechnology, University College London, London WC1H 0AH, United Kingdom.

Physical Review Letters
|February 29, 2020
PubMed
Summary
This summary is machine-generated.

Researchers enhanced silicon quantum device readout speed using a Josephson parametric amplifier. This advancement enables faster single-shot readout of spin qubits, crucial for scalable quantum computing and error correction.

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Area of Science:

  • Quantum Computing
  • Solid-State Physics

Background:

  • Silicon quantum devices are promising for large-scale quantum computing.
  • Gate-based sensing of spin qubits offers scalable readout but requires improved sensitivity for fast feedback in error correction.

Purpose of the Study:

  • To enhance the sensitivity and reduce integration time for gate-based sensing of silicon spin qubits.
  • To enable faster single-shot readout for fault-tolerant quantum computation.

Main Methods:

  • Combined radio-frequency gate-based sensing at 622 MHz with a Josephson parametric amplifier (500-800 MHz band).
  • Utilized a silicon double quantum dot in a nanowire transistor for readout.

Main Results:

  • Achieved a signal-to-noise ratio enabling an estimated 99.7% fidelity single-shot readout in 1 μs.
  • Demonstrated a 30x speed improvement compared to systems without the Josephson parametric amplifier.
  • Reduced radio-frequency power requirements while maintaining signal-to-noise ratio.

Conclusions:

  • The integration of Josephson parametric amplifiers significantly accelerates spin qubit readout in silicon.
  • Achieved readout speeds meet requirements for fault-tolerant quantum computing.
  • Identified noise sources and outlined pathways for further readout speed enhancement.