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MON: Monday Contributed Sessions
MON 17: Quantum Communication and Networks: Theory
MON 17.7: Vortrag
Montag, 8. September 2025, 18:00–18:15, ZHG010
Unlocking Quantum Advantage in Distributed Communication Networks — •Ananya Chakraborty1, Ram Krishna Patra1, Kunika Agarwal1, Samrat Sen1, Pratik Ghosal1, Sahil Gopalkrishna Naik1, Manik Banik1, Mir Alimuddin3, Edwin Peter Lobo2, and Amit Mukherjee4 — 1Department of Physics of Complex Systems, S. N. Bose National Center for Basic Sciences, Block JD, Sector III, Salt Lake, Kolkata 700106, India. — 2Laboratoire d'Information Quantique, Universite libre de Bruxelles (ULB), Av. F. D. Roosevelt 50, 1050 Bruxelles, Belgium. — 3ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Av. Carl Friedrich Gauss 3, 08860 Castelldefels (Barcelona), Spain — 4Indian Institute of Technology Jodhpur, Jodhpur 342030, India
In this work (Phys.Rev.A,vol.111,032617(2025)), we show a quantum advantage in multipartite communication complexity using n+1 partite GHZ states, enabling perfect evaluation of a global Boolean function with an n-1 bit reduction over classical protocols. Even for noisy GHZ states this advantage persists.For n = 3 and 4, genuine multipartite entanglement is necessary; for n greater than 4, inseparable states can suffice, broadening the range of useful quantum resources. In this work(New J. Phys. 27 023027), we show that qubit communication can outperform classical strategies in simulating MACs, without shared entanglement, bypassing the Frenkel-Weiner bound via joint quantum decoding. Our protocol links to nonlocality without entanglement,semi-device-independent certification of entangled measurements.
Keywords: Quantum Entanglement; Distributed Communication Networks; Frenkel–Weiner bound; multiple access channels (MAC); multipartite communication complexity