Quantum technology researches at NICT

1. Quantum information and communications research at NICT

Speaker:
Masahiro Takeoka

Abstract:
Quantum information and communications technologies (Quantum ICT) will open up novel directions of communication, such as unconditionally secure cryptography or communication reaching ultimate capacity. In this talk, we give an overview of our recent research activities at Quantum ICT Advanced Development Center in NICT. It includes quantum key distribution network and its applications, photonic quantum information processing, ion trap technologies for frequency standards and future quantum information processing applications, and fundamental theory of quantum information and communication.


Superconducting device research at NICT

Speaker:
Hirotaka Terai

Abstract:
Superconductor has very unique characteristics such as zero resistance and perfect diamagnetic resulted from macroscopic quantum effect. In this talk, we introduce our recent research activities on superconducting devices focusing on superconducting nanowire single-photon detector (SSPD) with high detection efficiency at near infrared wavelength and superconducting qubit based on nitride superconductor.


Light-matter interaction beyond ‘strong coupling’ in circuit quantum electrodynamics

Speaker:
Kouichi Semba

Abstract:
The superconducting qubit-oscillator system is an ideal physical system for studying the interaction of a very strong light-matter interaction.  We have succeeded in realizing the unexplored strong coupling regime by using the macroscopic quantum system such as superconducting artificial atom and its huge dipole moment, large Josephson inductance and large zero-point fluctuation current of the LC-oscillator. I will introduce ongoing research topics in our Macroscopic Quantum Physics project especially, strange nature of the molecular-like state of light and matter observed in the deep-strong-coupling regime that is difficult to be reached by conventional cavity-QED experiment using natural atom and cavity resonator.