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The Quantum-Mechanical Model of an Atom

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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
14:58

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Published on: June 3, 2015

Quantum coherence in a one-electron semiconductor charge qubit.

K D Petersson1, J R Petta, H Lu

  • 1Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.

Physical Review Letters
|January 15, 2011
PubMed
Summary
This summary is machine-generated.

We investigated quantum coherence in a semiconductor charge qubit, achieving a maximum coherence time of 7 nanoseconds. This was observed at the charge degeneracy point, minimizing sensitivity to gate voltage fluctuations.

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Last Updated: Jun 5, 2026

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
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Area of Science:

  • Quantum computing
  • Semiconductor physics
  • Solid-state qubits

Background:

  • Quantum coherence is crucial for quantum computation.
  • Semiconductor quantum dots offer a promising platform for scalable qubits.
  • Maintaining coherence is a key challenge in qubit performance.

Purpose of the Study:

  • To investigate quantum coherence in a single-electron GaAs double quantum dot charge qubit.
  • To measure the coherence time and identify factors influencing it.
  • To compare experimental results with theoretical models.

Main Methods:

  • Fabrication of a GaAs double quantum dot with a single electron.
  • Application of voltage pulses to depletion gates for qubit rotations.
  • Noninvasive state readout using a quantum point contact charge detector.

Main Results:

  • A maximum coherence time of approximately 7 nanoseconds was measured.
  • The longest coherence time was observed at the charge degeneracy point.
  • Qubit level splitting showed first-order insensitivity to gate voltage fluctuations at this point.

Conclusions:

  • The charge degeneracy point is optimal for maximizing coherence time in this qubit system.
  • Experimental coherence times were compared with numerical simulations and 1/f noise models.
  • Understanding coherence limitations is essential for advancing semiconductor qubit technology.