Abstract
Semiconductor quantum dots are excellent candidates for ultrafast coherent manipulation of qubits by laser pulses on picosecond timescales or even faster. In inhomogeneous ensembles a macroscopic optical polarization decays rapidly due to dephasing, which, however, is reversible in photon echoes carrying complete information about the coherent ensemble dynamics. Control of the echo emission time is mandatory for applications. Here, we propose a concept to reach this goal. In a two-pulse photon echo sequence, we apply an additional resonant control pulse with multiple of 2π area. Depending on its arrival time, the control slows down dephasing or rephasing of the exciton ensemble during its action. We demonstrate for self-assembled (In,Ga)As quantum dots that the photon echo emission time can be retarded or advanced by up to 5 ps relative to its nominal appearance time without control. This versatile protocol may be used to obtain significantly longer temporal shifts for suitably tailored control pulses.
Highlights
Semiconductor quantum dots are excellent candidates for ultrafast coherent manipulation of qubits by laser pulses on picosecond timescales or even faster
We propose a simple approach to this problem and perform a proof of principle demonstration of resonant optical control of the photon echo (PE) timing in self-assembled semiconductor quantum dots (QDs), leveraging concepts of multi-wave mixing in TLS32
The results of the simulations are in excellent agreement with the experimental data in Figs. 3 and 4, considering the temporal shifts of the PE, as well as their magnitude for pulse areas Θ1 and ΘC up to 2π
Summary
Semiconductor quantum dots are excellent candidates for ultrafast coherent manipulation of qubits by laser pulses on picosecond timescales or even faster. We demonstrate for self-assembled (In,Ga)As quantum dots that the photon echo emission time can be retarded or advanced by up to 5 ps relative to its nominal appearance time without control. This versatile protocol may be used to obtain significantly longer temporal shifts for suitably tailored control pulses. Ensembles of quantum emitters in solids typically possess significant inhomogeneous broadening of the optical transition frequency This might be considered as a drawback, as it leads to rapid dephasing of a macroscopic polarization in the medium. It was shown that rapid dephasing has significant impact even during excitation with ps-pulses, leading to a complex temporal evolution of the coherent optical response[21,22]
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