Quantum light sources using InAs quantum dots
David Ritchie
university of Cambridge
David Ritchie is Professor of Experimental Physics and Head of the Semiconductor Physics group at the Cavendish laboratory in Cambridge, UK. He received his first degree, in physics, from the University of Oxford in 1980 and his D Phil from the University of Sussex in 1986. Since then, he has been working on III-V semiconductor physics and has extensive experience of the growth, fabrication and measurement of low dimensional electronic and optical devices. He has published over 1100 papers and was awarded the 2008 Tabor medal and prize by the UK Institute of Physics.
Abstract
I will describe work undertaken in collaboration between the Cavendish Laboratory and the Toshiba Research Europe Laboratory, based in Cambridge. In this research we have fabricated and demonstrated triggered sources of... [ view full abstract ]
I will describe work undertaken in collaboration between the Cavendish Laboratory and the Toshiba Research Europe Laboratory, based in Cambridge. In this research we have fabricated and demonstrated triggered sources of single-photons and entangled-photon pairs using self-assembled InAs quantum dots embedded in GaAs/AlGaAs heterostructures.
Single-photon sources operating in the wavelength range 0.8 – 1.5 µm have been developed where the probability of multi-photon emission is as low as 2%. We are able to electrically tune the emission energy by up to 25meV allowing observation of two-photon interference between photons emitted from different quantum dots.
Our sources of polarization entangled-photon pairs rely on the radiative decay of an InAs quantum dot from a biexciton state to the ground state via an intermediate exciton state. We have developed several techniques to tune the splitting of the exciton state to less than 0.5 µeV and allow entangled-photon emission.
We have increased the fidelity of the entangled state to over 70% by control of the growth process and to over 90% by time gating as well as demonstrating the operation of a high-fidelity entangled-photon light emitting diode. Recent use of these sources to demonstrate quantum teleportation and a quantum relay will be described
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Authors
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David Ritchie
(university of Cambridge)
Topic Area
Quantum dots
Session
PL3b » Plenary Speeches (10:45 - Friday, 9th December, Amphitheatre 25)
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