Bright Polarized Single-Photon Source Based on a Linear Dipole

Quantifying n-photon indistinguishability with a cyclic integrated interferometer

“…A four-photon state is generated from a quantum dot single-photon source (QDSPS). The QDSPS is based on a neutral InGaAs quantum dot embedded in an electrically-contacted micropillar cavity [27,36], which is placed inside a cryostat at 5 K. The QDSPS is excited using acoustic-phonon-assisted near-resonant excitation [9] using a 15 ps laser pulse centred at 924.4 nm, at a repetition rate of 82 MHz. This excitation scheme allows for increased source efficiency and stability, a key requirement for multi-photon experiments.…”

“…(c) Suitable phase shifters can be added, to make the phases acquired by a photon detected on the upper output port equal to the ones that would have been acquired if detection occurred on the lower output port as in case (b). The QDSPS is excited using acoustic-phonon assisted near-resonant (∆λ = 0.7 nm) excitation [9] with a 10 ps pulsed (82 MHz) laser at λ=924.4 nm. We apply a voltage of V = -2.0 V to tune the QD into resonance with the cavity.…”

“…Furthermore, scaling up to larger photon numbers is a key element to activate quantum speed up, implement fault tolerance, and reach a higher number of users in a quantum network. Experimentally, the efficient generation of identical single photons is indeed an important technological challenge that is currently addressed with two main approaches, one based on multiplexing many heralded single-photon sources [4,5], the other based on bright single emitters, namely semiconductor quantum dots [6][7][8][9].…”

“…Schematic of the experimental setup to generate a single photons stream. (a) The single photon stream is generated by a quantum dot single-photon source based on a neutrally charged InGaAs quantum dot embedded in an electricallycontacted micropillar (∅ = 2 µm) cavity operating at ∼5 K. The QDSPS is excited using acoustic-phonon assisted near-resonant (∆λ = 0.7 nm) excitation[9] with a 10 ps pulsed (82 MHz) laser at λ=924.4 nm. We apply a voltage of V = -2.0 V to tune the QD into resonance with the cavity.…”

Swing-up of quantum emitter population using detuned pulses

“…We now consider the excitation of a specific system, namely a quantum dot excited by an optical laser pulse. Semiconductor quantum dots have already been shown to perform well as deterministic single-photon sources [1,7,9,10,[33][34][35][36], for which a high-fidelity preparation of the excited state is necessary. In such a system, the energy separation of ground and excited state is in the range of 1 − 2 eV and typical detunings of the laser are of the order of several meV.…”