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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

Quantum-dot-based resonant exchange qubit.

J Medford1, J Beil, J M Taylor

  • 1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.

Physical Review Letters
|August 20, 2013
PubMed
Summary
This summary is machine-generated.

We developed a novel solid-state qubit using electron exchange interactions for rapid control. This qubit demonstrates high performance with suppressed leakage and long coherence times, validated by theoretical models.

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Area of Science:

  • Quantum computing
  • Solid-state physics
  • Electron spin qubits

Background:

  • Quantum bits (qubits) are fundamental to quantum computation.
  • Controlling qubit states rapidly and with high fidelity is crucial for building quantum computers.
  • Solid-state systems offer scalability for quantum hardware.

Purpose of the Study:

  • To introduce a new solid-state qubit architecture.
  • To demonstrate rapid and full qubit control using exchange interactions.
  • To investigate qubit performance metrics like gate times and coherence.

Main Methods:

  • Utilizing exchange interactions between confined electrons for qubit control.
  • Employing radio-frequency (rf) gate-voltage pulses for manipulation.
  • Operating at a detuning sweet spot to minimize leakage.
  • Measuring qubit performance using multipulse echo techniques.

Main Results:

  • Achieved two-axis qubit control.
  • Demonstrated a π/2-gate time of 2.5 nanoseconds.
  • Obtained a coherence time of 19 microseconds.
  • Suppressed leakage errors via a large exchange gap at the sweet spot.

Conclusions:

  • The developed solid-state qubit offers rapid and precise control.
  • The qubit architecture shows promise for high-fidelity quantum operations.
  • Experimental results align well with theoretical predictions, including hyperfine noise effects.