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Suppression of Phonon-mediated Decoherence in Telecom-Compatible Semiconductor Quantum Emitters

Kimberley C. Hall, Ajan P. Ramachandran, Grant R. Wilbur, Sabine O’Neal, DENNIS GLENN DEPPE

Published Jul 30, 2021• 0 citations
Publisher

Abstract

We report the demonstration of adiabatic rapid passage on single solid-state quantum emitters based on semiconductor quantum dots. By extending our earlier experiments employing femtosecond pulse shaping for rapid and arbitrary qubit rotations to the strong-driving regime, we demonstrate full suppression of decoherence tied to LA phonon coupling. Our results will support the development of single photon sources and distributed quantum networks using semiconductor quantum dots.

DOI
10.1117/12.2594570

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We report the demonstration of adiabatic rapid passage on single solid-state quantum emitters based on semiconductor quantum dots. By extending our earlier experiments employing femtosecond pulse shaping for rapid and arbitrary qubit rotations to the strong-driving regime, we demonstrate full suppression of decoherence tied to LA phonon coupling. Our results will support the development of single photon sources and distributed quantum networks using semiconductor quantum dots.
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We demonstrate adiabatic rapid passage on a subpicosecond time scale in a single semiconductor quantum dot, enabling the exploration of a regime of strong (and rapidly varying) Rabi energies for optical control of excitons. An observed dependence of the exciton inversion efficiency on the sign of the pulse chirp demonstrates the dominance of phonon-mediated dephasing, which is suppressed for positive chirp at low temperature. Our findings will support the realization of dynamical decoupling strategies and suggest that multiphonon emission and/or non-Markovian effects should be taken into account.
Semiconductor quantum dots (QDs) may be applied to solid-state quantum emitters of interest for quantum light sources or nodes in distributed quantum networks. For such emitters, resonant optical driving results in the highest degree of photon indistinguishability, but leads to the need to reject scattered light from the laser used to drive the emitter. In this work, we apply femtosecond pulse shaping techniques to the development of quantum state inversion strategies for QD emitters that optimize fidelity and source brightness. The control protocols we have developed would be applicable to a wide range of solid-state QE systems.
Pulse shaping techniques are used to demonstrate quantum control of exciton qubits in InAs quantum dots. Linearly chirped laser pulses are used to demonstrate adiabatic rapid passage in a single quantum dot on a subpicosecond timescale. The observed dependence of the exciton inversion efficiency on the sign of the pulse chirp identifies phonons as the dominant source of dephasing, which can be suppressed for positive chirp at low temperatures. The use of optimal quantum control theory to engineer a single optical pulse to implement simultaneous π and 2π single qubit gates in two uncoupled quantum dots is demonstrated. This work will support the use of pulse shaping in solid-state quantum hardware.
Excitation of a semiconductor quantum dot with a chirped laser pulse allows excitons to be created by rapid adiabatic passage. In quantum dots this process can be greatly hindered by the coupling to phonons. Here we add a high chirp rate to ultrashort laser pulses and use these pulses to excite a single quantum dot. We demonstrate that we enter a regime where the exciton-phonon coupling is effective for small pulse areas, while for higher pulse areas a decoupling of the exciton from the phonons occurs. We thus discover a reappearance of rapid adiabatic passage, in analogy to the predicted reappearance of Rabi rotations at high pulse areas. The measured results are in good agreement with theoretical calculations.