77 citations · 626 across the 46 of their papers we have counts for
12 papers · 1 filter
Fully Quantum Source Compression with a Quantum Helper
Min-Hsiu Hsieh, Shun Watanabe
We study source compression with a helper in the fully quantum regime, extending our earlier result on classical source compression with a quantum helper [arXiv:1501.04366, 2015].…
Source Compression with a Quantum Helper
Min-Hsiu Hsieh, Shun Watanabe
We study classical source coding with quantum side-information where the quantum side-information is observed by a helper and sent to the decoder via a classical channel. We derive…
Private and Quantum Capacities of More Capable and Less Noisy Quantum Channels
Shun Watanabe
Two new classes of quantum channels, which we call more capable and less noisy, are introduced. The more capable class consists of channels such that the quantum capacities of the…
Narrow basis angle doubles secret key in the BB84 protocol
Ryutaroh Matsumoto, Shun Watanabe
We consider a modified version of the BB84 quantum key distribution protocol in which the angle between two different bases are less than . We show that the channel parameter…
Optimal Axis Compensation in Quantum Key Distribution Protocols over Unital Channels
Shun Watanabe, Ryutaroh Matsumoto, Tomohiko Uyematsu
The axis compensation is a procedure in which the sender and the receiver compensate the axes of their transmitter and detector so that the bit sequence can be transmitted more rel…
A Study of Channel Estimation and Postprocessing in Quantum Key Distribution Protocols
Shun Watanabe
This thesis investigate the channel estimation and the postprocessing of the quantum key distribution protocols. In particular, we propose a new channel estimation procedure, in wh…