Inventor
TOMITA AKIHISA
JP19 patents
⚠️ This page may combine multiple inventors who share the name “TOMITA AKIHISA”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
NEC CORP
14 patentsUS6895092B2May 17, 2005
Cryptographic key distribution method and apparatus thereof
NEC CORP42 citations92
US6678379B1Jan 13, 2004
Quantum key distribution method and apparatus
NEC CORP80 citations92
US6665486B2Dec 16, 2003
Single photon generating apparatus
NEC CORP20 citations92
US6444999B1Sep 3, 2002
Quantum circuit
NEC CORP42 citations92
US4982255AJan 1, 1991
Avalanche photodiode
NEC CORP29 citations92
US6014394AJan 11, 2000
Semiconductor laser
NEC CORP9 citations73
US5559820ASep 24, 1996
Multiple quantum well semiconductor laser
NEC CORP8 citations73
US5351254ASep 27, 1994
Semiconductor laser
NEC CORP8 citations73
US11502831B2Nov 15, 2022
Transmitting device, receiving device, quantum key distribution method, and quantum key distribution program for quantum key distribution system
NEC CORP2 citations72
US5859865AJan 12, 1999
Semiconductor laser
NEC CORP3 citations62
US5642372AJun 24, 1997
Quantum-well type semiconductor laser device having multi-layered quantum-well layer
NEC CORP6 citations62
US12519623B2Jan 6, 2026
Reception device, quantum key distribution system, and method for detecting quantum signal
NEC CORP0 citations59
US12489614B2Dec 2, 2025
Photon detection device, reception device, quantum key distribution system, and method for detecting quantum signal
NEC CORP0 citations59
US12549341B2Feb 10, 2026
Reception device, quantum key distribution system, and method for detecting quantum signal
NEC CORP0 citations48
JAPAN SCIENCE & TECH AGENCY
2 patentsUNIV HOKKAIDO NAT UNIV CORP
2 patentsUS11362817B2Jun 14, 2022
Quantum cryptographic key output apparatus, quantum cryptographic key communication system, and quantum cryptographic key output method
UNIV HOKKAIDO NAT UNIV CORP5 citations72
US11057201B2Jul 6, 2021
Random number sequence generation apparatus, quantum encryption transmitter, and quantum encryption communication system
UNIV HOKKAIDO NAT UNIV CORP1 citations62