Matthieu R. Bloch is a Professor in the School of Electrical and Computer Engineering at the Georgia Institute of Technology, where he has been on the faculty since 2009. His research interests are in information theory, error-control coding, wireless communications, cryptography, and quantum information. He was an Associate Editor for the IEEE Transactions on Information Theory from 2016 to 2019 and again from 2021 to 2024, and has served on the Board of Governors of the IEEE Information Theory Society since 2016, currently as Senior Past President. He was also an Associate Editor for the IEEE Transactions on Information Forensics and Security from 2019 to 2023. He is co-recipient of the IEEE ComSoc/IT Society 2011 Joint Paper Award, the 2025 IEEE Joy Thomas Tutorial Paper Award, the IEEE ComSoc/IT Society 2026 Joint Paper Award, and co-author of Physical-Layer Security: From Information Theory to Security Engineering (Cambridge University Press).
Presentation Title:
Quantum Ring States
Presentation Abstract:
Quantum ring states are non-Gaussian mixed states obtained by uniformly modulating the phase of one mode of a bipartite Gaussian resource and transmitting the modulated mode through a lossy thermal bosonic channel. For resources such as two-mode squeezed vacuum (TMSV) states and split coherent states, continuous phase modulation produces Fock-diagonal classical states characterized by hypergeometric functions. In this talk, we discuss the role of quantum ring states in several fundamental problems, including closed-form achievable communication rates for \ac{PSK} modulation over lossy thermal bosonic channels across a broad range of channel parameters, a proof that quantum reading with non-classical resources provides an advantage in the presence of thermal noise, and improved achievable covert throughputs for one-way and round-trip lossy thermal bosonic channels.