Video URL
https://pirsa.org/16110086Bright nanoscale source of highly entangled photon pairs
APA
Reimer, M. (2016). Bright nanoscale source of highly entangled photon pairs. Perimeter Institute for Theoretical Physics. https://pirsa.org/16110086
MLA
Reimer, Michael. Bright nanoscale source of highly entangled photon pairs. Perimeter Institute for Theoretical Physics, Nov. 22, 2016, https://pirsa.org/16110086
BibTex
@misc{ scivideos_PIRSA:16110086, doi = {10.48660/16110086}, url = {https://pirsa.org/16110086}, author = {Reimer, Michael}, keywords = {Quantum Foundations}, language = {en}, title = {Bright nanoscale source of highly entangled photon pairs}, publisher = {Perimeter Institute for Theoretical Physics}, year = {2016}, month = {nov}, note = {PIRSA:16110086 see, \url{https://scivideos.org/index.php/pirsa/16110086}} }
Michael Reimer Institute for Quantum Computing (IQC)
Abstract
The on-demand generation of bright entangled photon pairs is highly needed in quantum optics and emerging quantum information applications. However, a quantum light source combining both high fidelity and on-demand bright emission has proven elusive with current leading photon technologies. In this work we present a new bright nanoscale source of strongly entangled photon pairs generated with a position controlled nanowire quantum dot. The major breakthrough in the nanowire growth to achieve both bright photon emission and highly entangled photon pairs will be discussed [2, 3]. Recent experiments show the entanglement fidelity approaching unity, while enhancing the photon pair efficiency beyond state-of-the-art. We further demonstrate violation of the famous Clauser-Horne-Shimony-Holt inequality in the traditional linear basis [4]. This is the first bright nanoscale source of entangled photon pairs capable of violating Bell`s inequalities, opening up future experiments in quantum optics and developments in quantum information applications.
For long-distance quantum communication we convert polarization entangled photons generated by a single quantum dot into time-bin entangled photons by sending them through a polarization-time-bin interface [5]. Importantly, this conversion is performed without loss of entanglement strength. Time-bin entanglement is more robust for long-distance quantum communication than polarization entanglement, since time-bin entangled photons are insensitive to thermal and mechanical disturbances in optical fibers.
References
[1] M. A. M. Versteegh, M. E Reimer, K. D Jöns, D. Dalacu, P. J. Poole, A. Gulinatti, A. Giudice, and V. Zwiller, Nature Commun. 5, 5298 (2014).
[2] D. Dalacu, K. Mnaymneh, J. Lapointe, X. Wu, P. J. Poole, G. Bulgarini, V. Zwiller, and M. E. Reimer, Nano Lett. 12 (11), 5919-5923 (2012).
[3] M. E. Reimer et al., Phys. Rev. B 93, 195316 (2016).
[4] K. D. Jöns et al., arXiv:1510.03897 (2015).
[5] M. A. M. Versteegh, M. E. Reimer, A. A. van den Berg, G. Juska, V. Dimastrodonato, A. Gocalinska, E. Pelucchi, and V. Zwiller, Phys. Rev. A 92, 033802 (2015).