Lecturer: Dr. Nitzan Livneh
Affiliation: Racah Institute of Physics,
The Hebrew University of Jerusalem
Abstract:
Quantum technology is a new field of
research, aimed to utilize the quantum
nature of systems for various applications,
ranging from sensing of magnetic fields, to
the implementation of quantum logical gates
and quantum information. An essential
building block for future quantum
information technologies, are single
photons. Single photons can serve as “flying
qubits”, enabling the transmission of
quantum information over a long distance.
At this point however, no deterministic
source of single photons exists, that can
operate as a device outside of the research
lab.
In this talk I will show our recent
advancements in the demonstration of a
scalable, efficient, room temperature
operating single photon source. The single
photons are emitted by a single colloidal
nanocrystal quantum dot. The emission is
directed by a hybrid metal-dielectric
nanoantenna, so that the photons could be
efficiently collected into optical fibers. The
mechanism behind the operation of the
device is explained as a combination of
photon optical guiding and coherent Bragg
scattering. Collection efficiency of more
than 20% with standard optics is achieved,
with a high purity of single photon emission.
Further optimization is predicted to enhance
the efficiency to over 80%. We hope that
such a device could be used in the near
future quantum key distribution systems for
example.
References
[1] Efficient Collection of Light from
Colloidal Quantum Dots with a Hybrid Metal–
Dielectric Nanoantenna, Livneh N, Harats M. G,
Yochelis S, Paltiel Y, Rapaport R, ACS
Photonics, 2015, 2 (12), pp 1669–1674
[2] A highly directional room-temperature
single photon device, Livneh N, Harats M. G,
Istrati D, Eisenberg H. S, Rapaport R, accepted
to nano letters