439 citations · 490 across the 11 of their papers we have counts for
5 papers · 1 filter
An one-time-pad key communication protocol with entanglement
Qing-yu Cai
We present an one-time-pad key communication protocol that allows secure direct communication with entanglement. Alice can send message to Bob in a deterministic manner by using lo…
Measurement, Trace, Information Erasure and Entropy
Qing-Yu Cai
We show that both information erasure process and trace process can be realized by projective measurement. And a partial trace operation consists to a projective measurement on a s…
Deterministic Secure Direct Communication Using Mixed state
Qing-yu Cai
We show an improved ping-pong protocol which is based on the protocol showed by Kim Bostrom and Timo Felbinger [Phys. Rev. Lett. 89, 187902 (2002); quant-ph/0209040]. We show that…
Accessible Information and Quantum operations
Qing-yu Cai
The accessible information decreases under quantum operations. We analyzed the connection between quantum operations and accessible information. We show that a general quantum proc…
Deterministic Secure Direct Communication Using Ping-pong protocol without public channel
Qing-yu Cai
Based on an EPR pair of qubits and allowing asymptotically secure key distribution, a secure communication protocol is presented. Bob sends either of the EPR pair qubits to Alice.…