Phase locking of a semiconductor double-quantum-dot single-atom maser

Y.-Y. Liu, T. R. Hartke, J. Stehlik, and J. R. Petta
Phys. Rev. A 96, 053816 – Published 8 November 2017
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Abstract

We experimentally study the phase stabilization of a semiconductor double-quantum-dot (DQD) single-atom maser by injection locking. A voltage-biased DQD serves as an electrically tunable microwave frequency gain medium. The statistics of the maser output field demonstrate that the maser can be phase locked to an external cavity drive, with a resulting phase noise L=99 dBc/Hz at a frequency offset of 1.3 MHz. The injection locking range, and the phase of the maser output relative to the injection locking input tone are in good agreement with Adler's theory. Furthermore, the electrically tunable DQD energy level structure allows us to rapidly switch the gain medium on and off, resulting in an emission spectrum that resembles a frequency comb. The free running frequency comb linewidth is 8 kHz and can be improved to less than 1 Hz by operating the comb in the injection locked regime.

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  • Received 24 July 2017

DOI:https://doi.org/10.1103/PhysRevA.96.053816

©2017 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
  1. Physical Systems
Atomic, Molecular & Optical

Authors & Affiliations

Y.-Y. Liu, T. R. Hartke, J. Stehlik, and J. R. Petta

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

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Issue

Vol. 96, Iss. 5 — November 2017

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