In our recent work we report on the coherent phase manipulation of quantum dot excitons by electric means. The phase manipulation was performed and quantified in a Ramsey experiment, where ultrafast electric detuning of the exciton energy is performed synchronous to double pulse ps laser excitation.
For the experimental realization we used low capacitance single quantum dot photodiodes which were electrically controlled by ultrafast, custom designed BiCMOS chips.
Original work: Widhalm, A.; Mukherjee, A.; Krehs, S.; Sharma, N.; Kölling, P.; Thiede, A.; Reuter, D.; Förstner, J.; Zrenner, A. (2018): Ultrafast electric phase control of a single exciton qubit. In: APPLIED PHYSICS LETTERS 112 (11), S. 111105. DOI: 10.1063/1.5020364.