Entanglement plays a vital role in quantum information processing.Owing to its unique material properties,silicon carbide recently emerged as a promising candidate for the scalable implementation of advanced quantum i...Entanglement plays a vital role in quantum information processing.Owing to its unique material properties,silicon carbide recently emerged as a promising candidate for the scalable implementation of advanced quantum information processing capabilities.To date,however,only entanglement of nuclear spins has been reported in silicon carbide,while an entangled photon source,whether it is based on bulk or chip-scale technologies,has remained elusive.Here,we report the demonstration of an entangled photon source in an integrated silicon carbide platform for the first time.Specifically,strongly correlated photon pairs are efficiently generated at the telecom C-band wavelength through implementing spontaneous four-wave mixing in a compact microring resonator in the 4H-silicon-carbide-on-insulator platform.The maximum coincidence-to-accidental ratio exceeds 600 at a pump power of 0.17 mW,corresponding to a pair generation rate of(9±1)×10^(3) pairs/s.Energy-time entanglement is created and verified for such signal-idler photon pairs,with the two-photon interference fringes exhibiting a visibility larger than 99%.The heralded single-photon properties are also measured,with the heralded g^((2))(0)on the order of 10^(−3),demonstrating the SiC platform as a prospective fully integrated,complementary metal-oxide-semiconductor compatible single-photon source for quantum applications.展开更多
基金financial support from the NIST ITL Building the Future program and CMU-NSF (2127499)The CMU team acknowledges the use of Bertucci Nanotechnology Laboratory at Carnegie Mellon University supported by grant BNL-78657879the Materials Characterization Facility supported by grant MCF-677785.
文摘Entanglement plays a vital role in quantum information processing.Owing to its unique material properties,silicon carbide recently emerged as a promising candidate for the scalable implementation of advanced quantum information processing capabilities.To date,however,only entanglement of nuclear spins has been reported in silicon carbide,while an entangled photon source,whether it is based on bulk or chip-scale technologies,has remained elusive.Here,we report the demonstration of an entangled photon source in an integrated silicon carbide platform for the first time.Specifically,strongly correlated photon pairs are efficiently generated at the telecom C-band wavelength through implementing spontaneous four-wave mixing in a compact microring resonator in the 4H-silicon-carbide-on-insulator platform.The maximum coincidence-to-accidental ratio exceeds 600 at a pump power of 0.17 mW,corresponding to a pair generation rate of(9±1)×10^(3) pairs/s.Energy-time entanglement is created and verified for such signal-idler photon pairs,with the two-photon interference fringes exhibiting a visibility larger than 99%.The heralded single-photon properties are also measured,with the heralded g^((2))(0)on the order of 10^(−3),demonstrating the SiC platform as a prospective fully integrated,complementary metal-oxide-semiconductor compatible single-photon source for quantum applications.
