Quantifying Synergy in Quantum Channels
November 27 @ 5:30 pm - 6:30 pm
Join us for an AESS Technical Talk by Dr. Kyunghoon Han of the University of Luxembourg!
Time and Location
November 27, 2025, 5:30 pm
ME 4463 (Maker Lab), Mackenzie Building, Carleton University (in person)
Abstract
In classical and quantum information-theoretic settings, partial information decomposition isolates unique, redundant and synergistic contributions, formalising more-than-the-parts information from multiple inputs. Quantum technologies already exploit collective effects, yet a unified, n-channel, synergy-aware decomposition remains <a href="http://absent.
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The talk introduces a channel-level synergy functional, Syn, defined in the Stinespring representation so that it is representation-free, invariant under local unitaries, monotone under completely positive trace-preserving maps, and compositional under series, parallel and product wiring. Syn augments the Neyman-Pearson theorem by supplying a channel-level criterion that certifies when a single joint decision statistic will outperform all separable strategies. (This includes joint measurements where the subsystems are not measured simultaneously.) Consequently, it provides provable strengthening of the receiver operating characteristic over the operational false-alarm region and, in bosonic radar, translates into either achieving the same detection probability with lower transmitted energy or attaining tighter false-alarm levels at a fixed <a href="http://power.
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Speaker(s): Dr. Kyunghoon Han
Room: ME 4463 (Maker Lab), Bldg: Mackenzie, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario, Canada