Controllable photonic time-bin qubits from a quantum dot

Lee, J.P., Wells, L.M., Villa, B., Kalliakos, S., Stevenson, R.M., Ellis, D.J.P., Farrer, I., Ritchie, D.A., Bennett, A.J. ORCID: https://orcid.org/0000-0002-5386-3710 and Shields, A.J. 2018. Controllable photonic time-bin qubits from a quantum dot. Physical Review X 8 (2) , 021078. 10.1103/PhysRevX.8.021078

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Abstract

Photonic time-bin qubits are well suited to transmission via optical fibers and waveguide circuits. The states take the form 1 √(2) (α|0⟩+eiϕβ|1⟩), with |0⟩ and |1⟩ referring to the early and late time bin, respectively. By controlling the phase of a laser driving a spin-flip Raman transition in a single-hole-charged InAs quantum dot, we demonstrate complete control over the phase, ϕ. We show that this photon generation process can be performed deterministically, with only a moderate loss in coherence. Finally, we encode different qubits in different energies of the Raman scattered light, paving the way for wavelength-division multiplexing at the single-photon level.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Publisher:	American Physical Society
ISSN:	2160-3308
Date of First Compliant Deposit:	17 July 2018
Date of Acceptance:	27 June 2018
Last Modified:	08 May 2023 02:17
URI:	https://orca.cardiff.ac.uk/id/eprint/113232

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