Study of the Purcell factor of a single photon source based on quantum dot nanostructure for quantum computing applications

Subject Areas : Journal of Optoelectronical Nanostructures

Mohammad Reza Mohebbifar ¹ (Department of Physics, Faculty of Science, Malayer University, Malayer, Iran)

Received: 2021-07-08 Accepted : 2021-11-25 Published : 2021-10-01

Keywords: Quantum Efficiency, Micro-Laser, Quantum Dot, Micro-Cavity, Energy Eigenvalues, Purcell factor,

Abstract :

Single photon sources are the basis of quantum
computing. An optical system including a quantum dot
(QD) within the micro-pillar cavity can be a candidate for
high quality single photon source. Here, the vacuum Rabi
splitting (VRS) of this optical system for different
situations was studied. The coupling constant threshold
of this Single photon source to start VRS, was calculated
for each of these situations. Then, given that the Purcell
factor threshold for using single photon source pulses in
linear optics quantum computing is , Purcell
factor behavior of this single photon source including a
QD with FWHM of 5μeV, was studied. The results
showed that to use the single photon pulses of this system
in quantum computation ( ), the FWHM of micropillar
cavity must be less than 100μeV. Also, for cavities
with normal FWHM range, if coupling constant is greater
than 50μeV, then and therefore its single
photons can be used for quantum computing.

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