Scalable integrated single-photon source

Abstract

Photonic qubits are key enablers for quantum information processing deployable across a distributed quantum network. An on-demand and truly scalable source of indistinguishable single photons is the essential component enabling high-fidelity photonic quantum operations. A main challenge is to overcome noise and decoherence processes to reach the steep benchmarks on generation efficiency and photon indistinguishability required for scaling up the source. We report on the realization of a deterministic single-photon source featuring near-unity indistinguishability using a quantum dot in an “on-chip” planar nanophotonic waveguide circuit. The device produces long strings of >100 single photons without any observable decrease in the mutual indistinguishability between photons. A total generation rate of 122 million photons per second is achieved, corresponding to an on-chip source efficiency of 84%. These specifications of the single-photon source are benchmarked for boson sampling and found to enable scaling into the regime of quantum advantage.

Interconnect-Free Multibit Arithmetic and Logic Unit in a Single Reconfigurable 3 μm2 Plasmonic Cavity

“…First, further Boolean generalization towards complex gates and ALU is a nontrivial task for which the latest inverse design tools can be advantageously applied. 43,44 Second, progress in light source integration by embedding single photons sources, [45][46][47][48][49][50] or by tunnel current-driven emission, [51][52][53] will enable integrating our planar 2D Boolean devices with laserfree on-chip optical excitation and ultimately to plasmon-based quantum technologies. 54…”

Nanoscale Positioning Approaches for Integrating Single Solid‐State Quantum Emitters with Photonic Nanostructures

“…With aid from nanoscale positioning tools, more efforts are expected to help understand how to recover the Fourier transform limited single‐photons from QDs broadened by the etched surfaces, for example, exploring surface passivation and oxide encapsulation [ 66 ] to improve optical properties of QDs and using gated structures to control the local charge environment. [ 67,68 ]…”

Charge Tunable GaAs Quantum Dots in a Photonic n-i-p Diode

“…Self-assembled quantum dots (QDs) are excellent candidates for creating indistinguishable single-photon emitters [1][2][3][4] as well as entangled photon pairs [5,6]. The most studied and advanced species are InGaAs QDs grown in the Stranski-Krastanov-mode (SK-QDs) in a GaAs matrix.…”