Observation of cross phase modulation in cold atom gradient echo memory

Anthony C Leung; K S Ida Melody; Aaron D Tranter; Karun V Paul; Geoff T Campbell; Ping Koy Lam; Ben C Buchler

doi:10.1088/1367-2630/ac8c64

New Journal of Physics (Jan 2022)

Observation of cross phase modulation in cold atom gradient echo memory

Anthony C Leung,
K S Ida Melody,
Aaron D Tranter,
Karun V Paul,
Geoff T Campbell,
Ping Koy Lam,
Ben C Buchler

Affiliations

Anthony C Leung: ORCiD; ARC Centre of Excellence for Quantum Computation and Communication Technology, Australia; Department of Quantum Science and Technology, Research School of Physics, The Australian National University , Acton, ACT 2601, Australia
K S Ida Melody: ORCiD; ARC Centre of Excellence for Quantum Computation and Communication Technology, Australia; Department of Quantum Science and Technology, Research School of Physics, The Australian National University , Acton, ACT 2601, Australia
Aaron D Tranter: ORCiD; ARC Centre of Excellence for Quantum Computation and Communication Technology, Australia; Department of Quantum Science and Technology, Research School of Physics, The Australian National University , Acton, ACT 2601, Australia
Karun V Paul: ARC Centre of Excellence for Quantum Computation and Communication Technology, Australia; Department of Quantum Science and Technology, Research School of Physics, The Australian National University , Acton, ACT 2601, Australia
Geoff T Campbell: ARC Centre of Excellence for Quantum Computation and Communication Technology, Australia; Department of Quantum Science and Technology, Research School of Physics, The Australian National University , Acton, ACT 2601, Australia
Ping Koy Lam: ORCiD; ARC Centre of Excellence for Quantum Computation and Communication Technology, Australia; Department of Quantum Science and Technology, Research School of Physics, The Australian National University , Acton, ACT 2601, Australia; Institute of Materials Research and Engineering, Agency for Science Technology and Research (A*STAR) , 2 Fusionopolis Way, 08-03 Innovis 138634, Singapore
Ben C Buchler: ORCiD; ARC Centre of Excellence for Quantum Computation and Communication Technology, Australia; Department of Quantum Science and Technology, Research School of Physics, The Australian National University , Acton, ACT 2601, Australia

DOI: https://doi.org/10.1088/1367-2630/ac8c64
Journal volume & issue: Vol. 24, no. 9
p. 093011

Abstract

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Strong nonlinear interactions between single photons have important applications in optical quantum information processing. Demonstrations of these interactions in cold atomic ensembles have largely been limited to exploiting slow light generated using electromagnetically induced transparency (EIT). However, these EIT implementations have limited achievable phase shifts due to spontaneous emission. Here, we demonstrate and characterize a scheme free from these limitations using gradient echo memory with inferred single photon phase shifts of 0.07 ± 0.02 μ rad. Excellent agreement with theoretical modelling was observed. Degradation of memory efficiency was observed for large phase shifts but strategies to overcome that are presented.

Published in New Journal of Physics

ISSN: 1367-2630 (Online)
Publisher: IOP Publishing
Country of publisher: United Kingdom
LCC subjects: Science: Physics
Website: https://iopscience.iop.org/journal/1367-2630

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