QUANTUM INFORMATION SCIENCE AND TECHNOLOGY II 9996 2016年 [査読有り]
Physical random numbers generated by quantum measurements are, in principle, impossible to predict. We have demonstrated the generation of physical random numbers by using a high-speed balanced photodetector to measure the quadrature amplitudes of...
QUANTUM INFORMATION SCIENCE AND TECHNOLOGY II 9996 2016年 [査読有り]
We report on the development of continuous-variable quantum key distribution (CV-QKD) system that are based on discrete quadrature amplitude modulation (QAM) and homodyne detection of coherent states of light. We use a pulsed light source whose wa...
Yun Zhang Ryuhi Okubo Mayumi Hirano Yujiro Eto Takuya Hirano
SCIENTIFIC REPORTS 5 2015年8月 [査読有り]
Spatially separated entanglement is demonstrated by interfering two high-repetition squeezed pulse trains. The entanglement correlation of the quadrature amplitudes between individual pulses is interrogated. It is characterized in terms of the suf...
Yujiro Eto Masaya Kunimi Hidekatsu Tokita Hiroki Saito Takuya Hirano
PHYSICAL REVIEW A 92(1) 013611 2015年7月 [査読有り]
We investigate flow properties of immiscible Bose-Einstein condensates composed of two different Zeeman spin states of Rb-87. Two spatially overlapping condensates in the optical trap are prepared by application of a resonant radio-frequency pulse...
pulses" target="_blank">Control of spin current in a Bose gas by periodic application of pulses
Eto Yujiro Sadgrove Mark Hasegawa Sho Saito Hiroki Hirano Takuya
人文科学研究科
理学部