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

Single photon sources are the basis of quantumcomputing. An optical system including a quantum dot(QD) within the micro-pillar cavity can be a candidate forhigh quality single photon source. Here, the vacuum Rabisplitting (VRS) of this optical system for differentsituations was studied. The coupling constant thresholdof this Single photon source to start VRS, was calculatedfor each of these situations. Then, given that the Purcellfactor threshold for using single photon source pulses inlinear optics quantum computing is , Purcellfactor behavior of this single photon source including aQD with FWHM of ۵μeV, was studied. The resultsshowed that to use the single photon pulses of this systemin quantum computation ( ), the FWHM of micropillarcavity must be less than ۱۰۰μeV. Also, for cavitieswith normal FWHM range, if coupling constant is greaterthan ۵۰μeV, then and therefore its singlephotons can be used for quantum computing.

Keywords:

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