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IEEE International Semiconductor Laser Conference (ISLC)

Quantum coherent revival in a room-temperature quantum-dot optical amplifier: a route towards practical quantum information processing

Igor Khanonkin, Johann Peter Reithmaier, G. Eisenstein

Published Oct 10, 2021• 0 citations
Publisher

Abstract

The hallmark quantum-optics phenomenon: quantum coherent revival was demonstrated in room-temperature quantum dot optical amplifiers. The revival originates from coherent excitation of, and interaction among, homogeneous subgroups within an inhomogeneous ensemble, which play the role of a multi qubits platform for practical quantum information processing.

DOI
10.1109/islc51662.2021.9615808

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The hallmark quantum-optics phenomenon: quantum coherent revival was demonstrated in room-temperature quantum dot optical amplifiers. The revival originates from coherent excitation of, and interaction among, homogeneous subgroups within an inhomogeneous ensemble, which play the role of a multi qubits platform for practical quantum information processing.
The use of ultrashort pulses allows to induce and observe quantum coherent effects in optical gain media where the coherence time is longer than the excitation pulses namely, room temperature quantum dot ensembles. We use InAs/InP quantum dot optical amplifiers as the experimental platform and have demonstrated effects such as coherently controlled Rabi Oscillations, Ramsey Fringes, Photon`Echoes, Prolongation of dephasing time via induced three pulse photon echoes. Recently we have advanced the field by demonstrating a hallmark experiment of quantum optics: Quantum Coherent collapse and revival which was never observed in a solid let alone at room temperature.
We demonstrate the hallmark concept of periodic collapse and revival of coherence in a room-temperature ensemble of quantum dots (QDs) in the form of a 1.5-mm-long optical amplifier. Femtosecond excitation pulses induce coherent interactions with a number of discrete homogeneous QD subgroups within an inhomogeneously broadened ensemble, which interfere constructively to induce coherent revival (CR). The amplitude decay of CR is dictated by the QD homogeneous linewidth, thus enabling its extraction in a double-pulse Ramsey-type experiment. The more common photon echo technique is also invoked and yields the same linewidth provided that both experiments use the same bias. A dephasing time T2{T}_{2}T2​ longer than 5 ps is extracted. This is a record long T2{T}_{2}T2​ for a room-temperature QD ensemble and testifies to the high quality of the InAs/InP QDs used in the experiments. Measured electrical bias and temperature dependencies of the transverse relaxation times (T2{T}_{2}T2​ and T2∗{T}_{2}^{*}T2∗​) enable the determination of the two main decoherence mechanisms: carrier-carrier and carrier-phonon scatterings.