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quant-ph2026
No extension of the Quantum Tensor Product admits a Superposition principle
Vincenzo Fiorentino, Kuntal Sengupta
Textbook quantum superposition refers to the feature that certain linear combinations of Hilbert space rays, each representing a valid quantum state, are themselves valid states. T…
quant-ph2026
How many systems can be dephased before the quantum switch becomes causally definite?
Yassine Benhaj, Kuntal Sengupta, Cyril Branciard
Quantum processes with indefinite causal order -- so-called causally nonseparable processes -- can exhibit various advantages over quantum circuits with a fixed or a well-defined c…
quant-ph2026
Quantum Nonlocality and Device-Independent Randomness are Robust to Noisy Signaling Channels
Kuntal Sengupta, Lewis Wooltorton
Given a pair of isolated devices that accept random binary inputs and return binary outputs, a user can deduce from the observed data alone if the underlying mechanism can be expla…