Efficient Two-Photon Interference with Pulse-Driven Quantum Emitters in Dynamic Environments

The ability to achieve distributed entanglement across distant quantum nodes is essential for the construction of scalable quantum networks and other fundamental quantum information processing operations including quantum teleportation and Bell inequality tests[1, 2]. For solid-state spin qubits, it can be achieved through photon interference on a beam splitter. The efficiency of these interference operations rely on the indistinguishability of photons arriving from different emitters. However, for quantum emitters in dynamic environments, uncorrelated environment fluctuations lead to differences in temporal and spectral profiles of emitted photons resulting in reduced photon indistinguishability. We simulate the TPI operation in a Hong-Ou-Mandel-type experiment for two distant qubits in diffusion-inducing environments. We find that when the emitters are driven by appropriate pulse sequences, besides their emission spectra having little dependence on the environment[3, 4], photon indistinguishability can be restored to optimal values paving the way for improved efficiency in photon-mediated QIP operations.
[1]P. Humphreys et al, Nature 558, 268 (2018);[2] Nat. Photonics 12, 516 (2018); [2]H F Fotso et al, Phys. Rev. Lett. 116, 033603 (2016); H F Fotso, arXiv:1801.04442v2.