Time-bin entangled photons from a quantum dot

Harishankar Jayakumar, Ana Predojević, Thomas Kauten, Tobias Huber, Glenn S. Solomon, Gregor Weihs

Research output: Contribution to journalArticlepeer-review

139 Scopus citations


Long-distance quantum communication is one of the prime goals in the field of quantum information science. With information encoded in the quantum state of photons, existing telecommunication fibre networks can be effectively used as a transport medium. To achieve this goal, a source of robust entangled single-photon pairs is required. Here we report the realization of a source of time-bin entangled photon pairs utilizing the biexciton-exciton cascade in a III/V self-assembled quantum dot. We analyse the generated photon pairs by an inherently phase-stable interferometry technique, facilitating uninterrupted long integration times. We confirm the entanglement by performing quantum state tomography of the emitted photons, which yields a fidelity of 0.69(3) and a concurrence of 0.41(6) for our realization of time-energy entanglement from a single quantum emitter.

Original languageEnglish (US)
Article number4251
JournalNature communications
StatePublished - Jun 26 2014
Externally publishedYes

Bibliographical note

Funding Information:
This work was funded by the European Research Council (project EnSeNa) and the Canadian Institute for Advanced Research through its Quantum Information Processing program. G.S.S. acknowledges partial support through the Physics Frontier Center at the Joint Quantum Institute (PFC@JQI).


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