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Injection Locking of a Semiconductor Double Quantum Dot Micromaser



Michael Gullans, Y.-Y. Liu, J. Stehlik, Jacob M. Taylor, Jason Petta


The semiconductor double quantum dot (DQD) micromaser generates photons through single electron tunneling events. Charge noise couples to the DQD energy levels, resulting in a maser linewidth that is 100 times larger than the Schawlow-Townes prediction. We demonstrate linewidth narrowing by more than a factor 10 using injection locking. The injection locking range is measured as a function of input power and shown to be in excellent agreement with the Adler equation. The position and amplitude of distortion sidebands that appear outside of the injection locking range are quantitatively examined. Our results show that this unconventional maser, which is impacted by strong charge noise and electron-phonon coupling, is well described by standard laser models.
Physical Review A (Atomic, Molecular and Optical Physics)


Quantum dots, spin qubits, maser


Gullans, M. , Liu, Y. , Stehlik, J. , Taylor, J. and Petta, J. (2015), Injection Locking of a Semiconductor Double Quantum Dot Micromaser, Physical Review A (Atomic, Molecular and Optical Physics), [online], (Accessed May 27, 2024)


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Created November 2, 2015, Updated June 2, 2021