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New scientific highlights- by MUST PIs Wörner, Chergui, and Richardson
FELs of Europe prize for Jeremy Rouxel- “Development or innovative use of advanced instrumentation in the field of FELs”
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NCCR MUST at Scientifica 2021- Lightning, organic solar cells, and virtual molecules
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A quantum memory for twisted photons

Date Fr, 27.02.2015 - Fr, 27.02.2015
Time 11.00
Speaker Prof. Elisabeth Giacobino, Equipe Optique Quantique, Laboratoire Kastler Brossel, Paris
Location Auditoire Stükelberg, Ecole de Physique (Quai Ernest-Ansermet, 24 - 1211 Genève)
Program A quantum memory relies on an efficient coupling between light and matter, in order to achieve reversible mapping of quantum photonic information in and out of the material system. Our system involves the transfer of quantum information from light to atoms
(writing) and back from atoms to light (retrieval), using electromagnetically induced transparency (EIT) in three‐level transitions in a cold cesium atomic ensemble.

With this set‐up we have shown efficient storage of pulses carrying orbital angular momentum (OAM) at the single photon level. Laguerre‐Gauss LG+1 and LG‐1 modes were imprinted on the signal pulse, using a spatial light modulator. Then superpositions of LG modes, i.e. Hermite‐Gauss modes, were stored and retrieved. A full memory characterization (process tomography) over the Bloch sphere was performed and allowed us to demonstrate quantum fidelity. We thus demonstrated a quantum memory for orbital
angular momentum photonic qubits.

Single photons carrying OAM are promising for the implementation of qubits and qudits since OAM constitutes a quantized and infinite space. Interfacing them with quantum memories opens the way to their use in quantum networks.
Download Abstract Giacobino 02 2015 (60 KB)
(75 KB)
Link Jean-Pierre Wolf
NCCR MUST Office : ETHZ IQE/ULP-HPT H3 | Auguste-Piccard-Hof 1 | 8093 Zurich | E-Mail
The National Centres of Competence in Research (NCCR) are a research instrument of the Swiss National Science Foundation