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Preprint Oct 2026

An exponential separation between entanglement-assisted and unassisted one-way quantum communication

A longstanding question in quantum communication complexity is whether some task can be accomplished with a small amount of communication in the presence of entanglement, yet require much more quantum communication in the absence of entanglement. Separations of this nature were previously known for relational problems...

Ryan A. Anselm, Srijita Kundu, Olivier Lalonde et al. · 0 citations
#machine learning Preprint Sep 2026

Optimal Low-Rank Quantum State Tomography with Bounded-Sample Joint Measurements

We determine the optimal sample complexity of low-rank quantum state tomography when each measurement may act jointly on at most $t$ samples. For sufficiently small $\varepsilon$, estimating an unknown state on $\mathbb{C}^d$ of rank at most $r$ to trace norm error $\varepsilon$ with constant success probability requir...

A. Nayak, Xing-Yu Zhou · 3 citations

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