3 papers
quant-ph2026
Ancilla Assisted Quantum Process Tomography using Bound entangled states
Gurvir Singh
Lu \textit{et al.} [Ann. Phys. (Berlin) \textbf{534}, 2100550 (2022)] posed the question of whether bound entangled states can be used for ancilla-assisted quantum process tomograp…
quant-ph2025
Graph theoretic quantum contextuality and unextendible Product Bases
Gurvir Singh, Arvind
Unextendible product bases(UPBs) are central to the study of local distinguishability of orthogonal product states. While their connection to quantum nonlocality via Bell inequalit…
quant-ph2025
Noisy dynamics of Gaussian entanglement: a transient bound entangled phase before separability
Gurvir Singh, Saptarshi Roy, Arvind
We discover a new class of Gaussian bound entangled states of four-mode continuous-variable systems. These states appear as a transient phase when certain NPT-entangled Gaussian st…