Low-noise GaAs quantum dots in a p-i-n diode

Abstract

Our GaAs quantum dots device exhibits ultra-low noise as evidenced by optical linewidths close-to the ideal limit, an elimination of blinking, charge locked by Coulomb blockade, high-fidelity spin initialization, and a long electron-spin lifetime.

The Deep Space Quantum Link: Prospective Fundamental Physics Experiments using Long-Baseline Quantum Optics

“…Alternatively, the Jennewein group proposed in 2013 [147] that quantum teleportation implemented with single emitters (e.g., quantum dots) could greatly improve teleportation fidelity for ground and space links. The technical challenges around such emitters make this approach challenging to implement; however, recently high-efficiency coupling of photons from quantum dot sources into optical fibers has been realized [148], as has generation (though not yet efficient extraction) of high quality polarization-entangled photon pairs [149,150].…”

“…SPDC-based) can only operate at a fraction of the clock rate due to inherent multi-pair emissions (see Appendix VI). Solid-state systems such as quantum dots have made huge advances recently [148][149][150], however their integration into flight-suitable, cryogenic packaging poses challenges. The long-range teleportation experiments would also benefit from the improved photon statistics from deterministic single-photons and entangled photons; see Section II C 2.…”

Quantum Communication Using Semiconductor Quantum Dots

“…To obtain sufficiently indistinguishable single photons from remote sources, QDs are a promising candidate. Although high indistinguishability in practice is a challenge (due to local dephasing effects and spectral diffusion [104]) several demonstrations have already already surpassed the classical limit of 50% two photon interference visibility of laser light (see section 4.2) [195]. The main advantage of QD single photons over the attenuated laser implementations is that, due to the limited visibility and the Poisson photon statistics, a Bell measurement using coherent light is less precise than using true single photons [196].…”

“…Very recently, a new record has been set by Zhai et al [195], reaching visibilities of up to 93% between QDs located in different cryostates. The high visibility was achieved without Purcell enhancement, tight spectral filtering, post-selection or any active stabilization, simply by using high quality, low noise, electrically tunable QD samples, leaving even room for further improvement [246,248].…”

Mapping and spectroscopy of telecom quantum emitters with confocal laser scanning microscopy

“…A shared fundamental requirement for two essential technologies in quantum information, namely quantum networks for secure communication [1][2][3] and on-chip photonic circuits for quantum computing [4,5], is the need for singlephoton emitters. Among various solid-state candidates, semiconductor quantum dots (QDs) emerge as a viable source of * Authors to whom any correspondence should be addressed.…”