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arXiv:1708.06254 · Physical review. B./Physical review. B

Ramsey fringes in a room-temperature quantum-dot semiconductor optical amplifier

Igor Khanonkin, Akhilesh Kumar Mishra, Ouri Karni, Saddam Banyoudeh, Florian Schnabel, Vitalii I. Sichkovskyi, Vissarion Mikhelashvili, Johann Peter Reithmaier, G. Eisenstein

Published Jun 26, 2018• 7 citations
arXivHTMLPDF

Abstract

Ramsey interference that enables careful control over quantum states is demonstrated here in an inhomogeneously broadened ensemble of quantum dots, which serve as the gain medium of a semiconductor waveguide operating at room temperature. A subfemtosecond-resolution pump-probe scheme reveals a clear oscillatory behavior of the amplitude and instantaneous frequency of the probe pulse. A unique phenomenon is also observed, whereby the temporal position of the output probe pulse also oscillates with the same periodicity. The latter cannot be observed in single-dot systems since it results from the distributed nature of the amplifier.

DOI
10.1103/physrevb.97.241117

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Ramsey interference that enables careful control over quantum states is demonstrated here in an inhomogeneously broadened ensemble of quantum dots, which serve as the gain medium of a semiconductor waveguide operating at room temperature. A subfemtosecond-resolution pump-probe scheme reveals a clear oscillatory behavior of the amplitude and instantaneous frequency of the probe pulse. A unique phenomenon is also observed, whereby the temporal position of the output probe pulse also oscillates with the same periodicity. The latter cannot be observed in single-dot systems since it results from the distributed nature of the amplifier.
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We demonstrate the ability to control quantum coherent Rabi-oscillations in a room-temperature quantum dot semiconductor optical amplifier (SOA) by shaping the light pulses that trigger them. The experiments described here show that when the excitation is resonant with the short wavelength slope of the SOA gain spectrum, a linear frequency chirp affects its ability to trigger Rabi-oscillations within the SOA: A negative chirp inhibits Rabi-oscillations whereas a positive chirp can enhance them, relative to the interaction of a transform limited pulse. The experiments are confirmed by a numerical calculation that models the propagation of the experimentally shaped pulses through the SOA.