4 papers
Covert Block-Activity Information Transmission over Thermal-Loss Bosonic Channels: Latency--Payload Limits and Finite-Key Achievability
Qipeng Qian, Yuntao Qian
We study covert block-activity information transmission over a thermal-loss bosonic channel, where messages are encoded in weight-constrained activity patterns that Bob must recove…
Optimal Probe State for Phase Estimation Under Covariant Measurement
Qipeng Qian, Christos N. Gagatsos
We study the optimization of input states for phase estimation under covariant measurements. Building on Holevo's framework, which provides the optimal covariant measurement for a…
Heralded enhancement in quantum state discrimination
Qipeng Qian, Christos N. Gagatsos
The discrimination of quantum states is a central problem in quantum information science and technology. Meanwhile, partial post-selection has emerged as a valuable tool for quantu…
Upper bounds on the purity of Wigner positive quantum states that verify the Wigner entropy conjecture
Qipeng Qian, Christos Gagatsos
We present analytical results toward the Wigner entropy conjecture, which posits that among all physical Wigner non-negative states the Wigner entropy is minimized by pure Gaussian…