Efficient Source of Shaped Single Photons Based on an Integrated Diamond Nanophotonic System

Abstract

An efficient, scalable source of shaped single photons that can be directly integrated with optical fiber networks and quantum memories is at the heart of many protocols in quantum information science. We demonstrate a deterministic source of arbitrarily temporally shaped single-photon pulses with high efficiency [detection efficiency ¼ 14.9%] and purity [g ð2Þ ð0Þ ¼ 0.0168] and streams of up to 11 consecutively detected single photons using a silicon-vacancy center in a highly directional fiberintegrated diamond nanophotonic cavity. Combined with previously demonstrated spin-photon entangling gates, this system enables on-demand generation of streams of correlated photons such as cluster states and could be used as a resource for robust transmission and processing of quantum information.

Diamond Integrated Quantum Nanophotonics: Spins, Photons and Phonons

“…Being robust single-photon sources [104], [105], the nitrogen-vacancy (NV) [106] and silicon-vacancy (SiV) [107] centers have over the years gained traction as promising candidates for a variety of applications in photonic quantum technologies [29], [108]. NV centers have been used in various proof-of-principle experiments, including, but not limited to quantum sensing [109], quantum teleportation [39], quantum error correction [85], [110], [111], demonstration of a multiqubit quantum processor with coherence times approaching a second for the electron spin [112] and a minute for the nuclear spin [99], fault-tolerant operations [36], and the realization of multinode quantum networks [49], [50].…”

Diamond Integrated Quantum Photonics: A Review

“…Being robust single-photon sources [102], [103], the nitrogen-vacancy (NV) [104] and silicon-vacancy (SiV) [105] centers have over the years gained traction as promising candidates for a variety of applications in photonic quantum technologies [29], [106]. NV centers have been used in various proof-of-principle experiments, including, but not limited to quantum sensing [107], quantum teleportation [39], quantum error correction [83], [108], [109], demonstration of a multiqubit quantum processor with coherence times approaching a second for the electron spin [110] and a minute for the nuclear spin [97], fault-tolerant operations [36], and the realization of multinode quantum networks [48], [49].…”

Robust multi-qubit quantum network node with integrated error detection

“…The fidelity gain from our error detection could be larger for more complex spin-photon entangling sequences, such as PHONE-type gates entangling successive photons with the nucleus or entangling a photon with multiple nuclei strongly coupled to the SiV. It also opens opportunities to operate more effectively in regimes where the SiV electron coherence properties deteriorate, including at higher temperatures as demonstrated here, and in a misaligned magnetic field as is required for acoustic spin control ( 29 ) and single-photon generation ( 30 ). The use of cavities with higher cooperativity as demonstrated previously ( 11 ) should allow for higher fidelity and efficiency of electron-spin photon and PHONE gates, as well as improved 29 Si state preservation during electron readout ( 21 ).…”