Deterministic single quantum dot nano-sources of entangled photon pairs (NanoEPR)

Lead Research Organisation: University of Cambridge
Department Name: Physics


The Consortium undertakes the development of deterministic solid-state source of polarization entangled photons with a high collection efficiency, for quantum communications and information processing. It will make use of the fact that a single dipole (a single atom...) emits only one photon pair per excitation cycle. The emitter under study will be a single quantum dot. The which path information contained in the energy of the emitted photons usually observed in quantum dots, will be erased by control of the nanostructure growth, application of a magnetic or electric field, or use of cavity effect. Quantum dots will be inserted in appropriate microresonators in order to efficiently collect the emitted photon pairs. High collection efficiencies together with the deterministic nature of the emission will result in a highly useful source for quantum communications. The project brings together partners with unique experience who have already achieved major breakthroughs in this field.


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Hudson AJ (2007) Coherence of an entangled exciton-photon state. in Physical review letters

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Stevenson RM (2008) Evolution of entanglement between distinguishable light states. in Physical review letters

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Hudson A (2008) Biphoton interference with a quantum dot source of entangled light in Physica E: Low-dimensional Systems and Nanostructures

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Bennett A (2009) Interference of dissimilar photon sources in Nature Physics

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Nicoll C (2009) MBE growth of In(Ga)As quantum dots for entangled light emission in Journal of Crystal Growth

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Young RJ (2009) Bell-inequality violation with a triggered photon-pair source. in Physical review letters

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Boyer De La Giroday A (2010) All-electrical coherent control of the exciton states in a single quantum dot in Physical Review B

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Salter CL (2010) An entangled-light-emitting diode. in Nature

Description We have developed entangled-photon sources for quantum coimmunications.
Exploitation Route For academic and industrial research and development.
Sectors Digital/Communication/Information Technologies (including Software),Security and Diplomacy

Description CNRS (Marcoussis) 
Organisation University of Plymouth
Department Centre for Robotics and Neural Systems (CNRS)
Country United Kingdom 
Sector Academic/University 
Start Year 2007
Description Max Planck Inst for Plasma Physics 
Organisation Max Planck Society
Department Max Planck Institute for Plasma Physics
Country Germany 
Sector Academic/University 
Start Year 2007
Description Physics at work 
Form Of Engagement Activity A talk or presentation
Part Of Official Scheme? No
Geographic Reach Regional
Primary Audience Schools
Results and Impact Physics at work takes place every year at the Cavendish Laboratory. A total of 2000 school students visit to listern to talks and demonstrations. My research group gives around 20 presentations to 25 students each year about semiconductor physics.

Heightened interest in science and particular physics amongst local school students. Physics undergraduates are currently at record numbers in Cambridge.
Year(s) Of Engagement Activity Pre-2006,2006,2007,2008,2009,2010,2011,2012,2013,2014