43 citations · 257 across the 27 of their papers we have counts for
5 papers · 1 filter
A Study of Transition of the Expansion of the Universe from a Phase of Deceleration to Acceleration through a Conversion of Matter into Dark Energy in the Framework of Brans-Dicke Theory
Sudipto Roy
The present study is based on a generalized form of Brans-Dicke (BD) theory where, the dimensionless BD parameter is regarded as a function of the scalar field, which is reciprocal…
Multipartite Entanglement Accumulation in Quantum States: Localizable Generalized Geometric Measure
Debasis Sadhukhan, Sudipto Singha Roy, Amit Kumar Pal +3
Multiparty quantum states are useful for a variety of quantum information and computation protocols. We define a multiparty entanglement measure based on local measurements on a mu…
Generalized Geometric Measure of Entanglement for Multiparty Mixed States
Tamoghna Das, Sudipto Singha Roy, Shrobona Bagchi +3
Computing entanglement of an arbitrary bipartite or multipartite mixed state is in general not an easy task as it usually involves complex optimization. Here we show that exploitin…
Diverging scaling with converging multisite entanglement in odd and even quantum Heisenberg ladders
Sudipto Singha Roy, Himadri Shekhar Dhar, Debraj Rakshit +2
We investigate finite-size scaling of genuine multisite entanglement in the ground state of quantum spin-1/2 Heisenberg ladders. We obtain the ground states of odd- and even-legged…
Enhancement of Quantum Correlation Length in Quenched Disordered Spin Chains
Debasis Sadhukhan, Sudipto Singha Roy, Debraj Rakshit +3
Classical correlations of ground states typically decay exponentially and polynomially, respectively for gapped and gapless short-ranged quantum spin systems. In such systems, enta…