Abstract
Quantum photonic integrated circuits (QPICs) on a GaAs platform allow the generation, manipulation, routing, and detection of non-classical states of light, which could pave the way for quantum information processing based on photons. In this article, the prototype of a multi-functional QPIC is presented together with our recent achievements in terms of nanofabrication and integration of each component of the circuit. Photons are generated by excited InAs quantum dots (QDs) and routed through ridge waveguides towards photonic crystal cavities acting as filters. The filters with a transmission of 20% and free spectral range ≥66 nm are able to select a single excitonic line out of the complex emission spectra of the QDs. The QD luminescence can be measured by on-chip superconducting single photon detectors made of niobium nitride (NbN) nanowires patterned on top of a suspended nanobeam, reaching a device quantum efficiency up to 28%. Moreover, two electrically independent detectors are integrated on top of the same nanobeam, resulting in a very compact autocorrelator for on-chip g(2)(τ) measurements.
Highlights
Quantum information processing (QIP) is a well-established scientific field that opens unconventional perspectives for information processing
GaAs platform (Figure 1), consisting of InAs quantum dots (QDs), photonic crystal waveguides (PhCWGs) and of photonic quantum circuit on a cavities (PhCCs) and PhCWGs, the emission from one or several QDs can be filtered on-chip so that single cavities (PhCCs), and superconducting single photon detectors (SSPDs) patterned on top of suspended nanobeams (SNBs)
Single photons are produced via spontaneous emission of excitons in quantum dots (QDs), efficiently funneled in waveguides, filtered by a photonic crystal cavity (PhCC) and detected by waveguide funneled in waveguides, filtered by a photonic crystal cavity (PhCC) and detected by waveguide superconducting single photon detectors (SSPDs)
Summary
Quantum information processing (QIP) is a well-established scientific field that opens unconventional perspectives for information processing. We present a prototype architecture of a fully integrated photonic quantum circuit on a cavities (PhCCs), and SSPDs patterned on top of suspended nanobeams (SNBs). GaAs platform (Figure 1), consisting of InAs QDs, photonic crystal waveguides (PhCWGs) and of PhCCs and PhCWGs, the emission from one or several QDs can be filtered on-chip so that single cavities (PhCCs), and SSPDs patterned on top of suspended nanobeams (SNBs). SNB of to a ridge waveguide single the photons originating from a singleon excitonic areinstead funneled circuits and since shorter lengths are sufficient to reach high absorption due to a tighter field confinement measured. Single photons are produced via spontaneous emission of excitons in quantum dots (QDs), efficiently funneled in waveguides, filtered by a photonic crystal cavity (PhCC) and detected by waveguide funneled in waveguides, filtered by a photonic crystal cavity (PhCC) and detected by waveguide superconducting single photon detectors (SSPDs).
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