Clark Group

Dr Alex Clark
Royal Society University Research Fellow and Senior Lecturer

Research interests and activities

Dr Alex S. Clark is a Royal Society University Research Fellow and proleptic Senior Lecturer working on Hybrid Quantum Network Technologies. Current projects include:

Molecular single photon sources
Quantum emitters in solid state systems
Atomic quantum memories
Nonlinear optical frequency conversion
Quantum imaging and spectroscopy

Major research topics

Nonlinear Photonics
Quantum Memories
Single Photon Sources
Single Molecules
Atomic Physics
Quantum Imaging

(pictured above: Nanocrystals containing organic molecules are capable of generating indistinguishable single photons on demand, which are useful for myriad quantum technologies)

Current postdocs and research fellows

Dr Rowan Hoggarth
Senior Research Associate
Dr Frederic Leroux
Research Associate (also with Weidner group)

Current PhD students

Paul Burdekin
(Based at Imperial)
Emma Pearce
(Based at Imperial)
Dominika Bogusz
(Based at Imperial)
John Yang
(Based at Imperial)
Tasos Fasoulakis
Mike Neville
Jingrui Zhang
Eesa Ali

Active grants

2021-24: QCS Hub Partnership Resource Fund, Atomic frequency conversion of on-demand photons
2017-present: Royal Society University Research Fellowship, Molecular Quantum Photonics
2017-22: EPSRC, QSUM

Previous grants

2018-2022: QuantERA European Consortium, ORQUID: Organic Quantum Integrated Devices
2017-2021: EPSRC Standard Grant, Molecular Microcavity Photon Source
2015-2017: Marie Sklodowska Curie Fellowship, Quantum Molecular Photon Source (QMoPS)

Recent publications

R. C. Schofield, C. Clear, R. A. Hoggarth, K. D. Major, D. P. S. McCutcheon, and A. S. Clark, “Photon indistinguishability measurements under pulsed and continuous excitation,” Phys. Rev. Research 4, 013037 (2022)
R. C. Schofield, P. Burdekin, A. Fasoulakis, L Devanz, D. P. Bogusz, R. A. Hoggarth, K. D. Major, and A. S. Clark, “Narrow and stable single photon emission from dibenzoterrylene in para-terphenyl nanocrystals,” ChemPhysChem (2021)
C. Toninelli, I. Gerhardt, A. S. Clark, A. Reserbat-Plantey, S. Götzinger, Z. Ristanović, M. Colautti, P. Lombardi, K. D. Major, I. Deperasińska, W. H. Pernice, F. H. L. Koppens, B. Kozankiewicz, A. Gourdon, V. Sandoghdar, and M. Orrit, “Single organic molecules for photonic quantum technologies,” Nature Materials 20, 1615-1628 (2021)
S. Boissier, R. C. Schofield, L. Jin, A. Ovvyan, S. Nur, F. H. L. Koppens, C. Toninelli, W. H. P. Pernice, K. D. Major, E. A. Hinds, and A. S. Clark, “Coherent characterisation of a single molecule in a photonic black box,” Nature Communications 12, 706 (2021)
P. Burdekin, S. Grandi, R. Newbold, R. A. Hoggarth, K. D. Major, and A. S. Clark, “Single-photon-level sub-Doppler pump-probe spectroscopy of rubidium,” Phys. Rev. Applied 14, 044046 (2020)
E. Pearce, C. C. Phillips, R. F. Oulton, and A. S. Clark, “Heralded spectroscopy with a fiber photon-pair source,” Appl. Phys. Lett. 117, 054002, Editor’s Highlight (2020)
R. C. Schofield, D. P. Bogusz, R. A. Hoggarth, S. Nur, K. D. Major, and A. S. Clark, “Polymer-encapsulated organic nanocrystals for single photon emission,” Opt. Mat. Express 10, 1586-1596 (2020)
C. Clear, R. C. Schofield, K. D. Major, J. Iles-Smith, A. S. Clark, and D. P. S. McCutcheon, “Phonon-induced optical dephasing in single organic molecules,” Phys. Rev. Lett. 124, 153602 (2020)