3 papers
quant-ph2026
From Analytic Structure to Quantum Complexity: Walsh-Pauli Representations of Continuum Operators
Raphael De Sousa, Partha Nandi, Francesco Petruccione
How does continuum operator structure appear in a finite qubit register? We address this question for analytic functions of diagonal operators represented in a binary basis, focusi…
quant-ph2026
Is Exact Markovianity Fundamental Once Time Is Relational?
Partha Nandi, Francesco Petruccione
Markovian open quantum theory assumes evolution with respect to an external classical time parameter, yet no preferred notion of time exists fundamentally in relativistic physics.…
gr-qc2026
State-Selective Signatures of Quantum and Classical Gravitational Environments
Partha Nandi, Sankarshan Sahu, Bibhas Ranjan Majhi +1
A unified framework is developed for determining whether a gravitational-wave (GW) background behaves as a classical field or as a genuinely quantum environment. Unified here means…