Abstract
A solid-state single-photon source emitting indistinguishable photons on-demand is an essential component of linear optics quantum computing schemes. However, the emitter will inevitably interact with the solid-state environment causing decoherence and loss of indistinguishability. In this paper, we present a comprehensive theoretical treatment of the influence of phonon scattering on the coherence properties of single photons emitted from semiconductor quantum dots. We model decoherence using a full microscopic theory and compare with standard Markovian approximations employing Lindblad-type relaxation terms. Significant differences between the two approaches are found.
Highlights
Figures of meritAn SPS has several important figures of merit, namely the degree of indistinguishability, the emission efficiency into the desired mode, usually denoted as the β-factor, and the total collection efficiency
In this paper we have presented a comprehensive theory of single-photon indistinguishability in semiconductor cQED
We included a pump level to account for time-jitter effects originating from capture or intra-dot relaxation processes associated with incoherent pumping schemes
Summary
An SPS has several important figures of merit, namely the degree of indistinguishability, the emission efficiency into the desired mode, usually denoted as the β-factor, and the total collection efficiency. Where G(H2O) M(t + τ, t) is the second-order correlation function for the HOM experiment, G(u2n)corr(t + τ, t) yields the uncorrelated coincidence events, the green curve in figure 1 (right), and can be modeled as a HOM experiment without beam splitter, and the operator A is chosen corresponding to the relevant photon quantum field. Another important figure of merit is the β-factor, describing the fraction of light emitted into the desired mode, which is most often the cavity mode due to its strong spatial directionality. We present novel results on the dependence of the indistinguishability on important parameters of the cavity QED system and review relevant results from the literature
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