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Injection Locking of a Semiconductor Double Quantum Dot Micromaser.

Y-Y Liu1, J Stehlik1, M J Gullans2

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

Physical Review. A, Atomic, Molecular, and Optical Physics
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Summary

We narrowed the emission linewidth of a semiconductor double quantum dot (DQD) micromaser by over 10 times. This was achieved by injection locking the DQD emission to a coherent tone, improving maser performance.

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Area of Science:

  • Quantum optics
  • Semiconductor physics
  • Mesoscopic systems

Background:

  • Emission linewidth is a critical parameter for masers and lasers.
  • Semiconductor double quantum dot (DQD) micromasers generate photons via electron tunneling.
  • Charge noise significantly broadens DQD micromaser linewidths, exceeding theoretical predictions.

Purpose of the Study:

  • To demonstrate linewidth narrowing in a DQD micromaser.
  • To investigate the effect of injection locking on maser linewidth.
  • To validate maser behavior against established laser models.

Main Methods:

  • Demonstrated injection locking of DQD micromaser emission to an external coherent tone.
  • Measured the injection locking range as a function of input power.
  • Quantitatively analyzed distortion sidebands outside the locking range.

Main Results:

  • Achieved linewidth narrowing exceeding a factor of 10.
  • Injection locking range agrees with the Adler equation.
  • Observed and analyzed distortion sidebands.
  • Demonstrated that the DQD micromaser, despite noise, follows standard laser models.

Conclusions:

  • Injection locking is an effective method for reducing DQD micromaser linewidth.
  • The DQD micromaser exhibits characteristics consistent with conventional laser theory.
  • This work advances the understanding and control of quantum light sources.