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Threshold Dynamics of a Semiconductor Single Atom Maser.

Y-Y Liu1, J Stehlik1, C Eichler1

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

Physical Review Letters
|September 27, 2017
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Researchers created a single atom maser using a semiconductor double quantum dot (DQD) in a microwave cavity. This device exhibits controllable masing and transitions from incoherent to coherent emission, aligning with maser theory.

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Area of Science:

  • Quantum optics
  • Solid-state physics
  • Mesoscopic devices

Background:

  • Single atom masers are crucial for quantum information processing.
  • Semiconductor quantum dots offer a scalable platform for quantum devices.
  • Controlling maser emission dynamics is key to advancing quantum technologies.

Purpose of the Study:

  • To demonstrate a single atom maser based on a semiconductor double quantum dot (DQD).
  • To investigate the masing threshold and emission properties.
  • To study the transition from incoherent to coherent emission in a DQD maser.

Main Methods:

  • Fabrication of a DQD embedded in a high-quality microwave cavity.
  • Application of a finite bias to drive the DQD out of equilibrium.
  • Development of a dynamic tuning protocol for controlling repumping rate.
  • Measurement of photon statistics to analyze emission characteristics.

Main Results:

  • Successful demonstration of a semiconductor DQD-based single atom maser.
  • Observation of sequential single electron tunneling leading to masing.
  • Controllable transition through the masing threshold via dynamic tuning.
  • Characterization of the crossover from incoherent to coherent emission.

Conclusions:

  • The semiconductor DQD maser operates reliably and exhibits tunable properties.
  • Experimental results are consistent with single atom maser theory, with minor adjustments for lead emission.
  • This work paves the way for scalable quantum devices utilizing semiconductor masers.