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Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...

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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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Charge qubit purification by an electronic feedback loop.

Gerold Kiesslich1, Gernot Schaller, Clive Emary

  • 1Institut für Theoretische Physik, Technische Universität Berlin, Berlin, Germany. gerold.kiesslich@tu-berlin.de

Physical Review Letters
|August 27, 2011
PubMed
Summary

We demonstrate a feedback scheme that stabilizes pure qubit states using detector current. This method enables robust initialization of solid-state qubits for quantum computing at any temperature.

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Area of Science:

  • Quantum computing
  • Solid-state physics
  • Quantum information science

Background:

  • Initializing qubits is crucial for quantum computation.
  • Current methods for qubit initialization can be complex and temperature-dependent.
  • Developing robust and efficient initialization techniques is an ongoing challenge.

Purpose of the Study:

  • To propose and demonstrate a novel closed-loop feedback scheme for qubit manipulation.
  • To achieve stabilization of pure delocalized qubit states.
  • To enable efficient and robust initialization of solid-state qubits.

Main Methods:

  • Utilizing a time-dependent electronic detector current directly back-coupled into qubit parameters.
  • Employing a capacitively coupled single-electron transistor as the detector model.
  • Analyzing the qubit state stabilization above a critical detector-qubit coupling threshold.

Main Results:

  • Demonstrated stabilization of pure delocalized qubit states.
  • Showcased electronic purification independent of the initial qubit state.
  • Achieved state stabilization after only a few electron jumps through the detector.

Conclusions:

  • The proposed feedback scheme offers an efficient and robust method for solid-state qubit initialization.
  • This technique is effective at arbitrary temperatures, simplifying quantum computational algorithms.
  • The electronic purification process is rapid and independent of the initial qubit state.