95 citations · 135 across the 8 of their papers we have counts for
9 papers
Designs without disorder: unitary -designs from a single-site bulk defect
Samudra Sur, Pratik Nandy
We show that an local defect is sufficient to generate approximate unitary -designs from an otherwise integrable quantum many-body system. Using a two-Pauli-kick (2PK) pr…
Control of Multipartite Entanglement through Anisotropy against Thermal Noise
Samudra Sur, Saikat Sur
Preserving multipartite entanglement in open many-body quantum systems is fundamentally limited by unavoidable environmental noise. We study the open-system dynamics of multipartit…
Interplay of Noise and Reservoir-induced Decoherence in Persistent Currents
Samudra Sur, Thierry Giamarchi
Persistent current is a hallmark of quantum phase coherence. We study the fate of the persistent current in a non-equilibrium setting, where a tight-binding ring is subjected to st…
Mechanisms of scrambling and unscrambling of quantum information in the ground state in spin chains: domain-walls, spin-flips and scattering phase shifts
Samudra Sur, Diptiman Sen
The spatiotemporal evolution of the out-of-time-order correlator (OTOC) measures the propagation and scrambling of local quantum information. For the transverse field Ising model w…
Weak universality, quantum many-body scars and anomalous infinite-temperature autocorrelations in a one-dimensional spin model with duality
Adithi Udupa, Samudra Sur, Sourav Nandy +2
We study a one-dimensional spin- model with three-spin interactions and a transverse magnetic field . The model has a symmetry, and a duality between a…
Effects of topological and non-topological edge states on information propagation and scrambling in a Floquet spin chain
Samudra Sur, Diptiman Sen
The action of any local operator on a quantum system propagates through the system carrying the information of the operator. This is usually studied via the out-of-time-order corre…
Probing quantum scars and weak ergodicity-breaking through quantum complexity
Budhaditya Bhattacharjee, Samudra Sur, Pratik Nandy
Scar states are special many-body eigenstates that weakly violate the eigenstate thermalization hypothesis (ETH). Using the explicit formalism of the Lanczos algorithm, usually kno…
Driven Hubbard model on a triangular lattice: tunable Heisenberg antiferromagnet with three-spin chiral term
Samudra Sur, Adithi Udupa, Diptiman Sen
We study the effects of a periodically varying electric field on the Hubbard model at half-filling on a triangular lattice. The electric field is incorporated through the phase of…
Floquet engineering of edge states in the presence of staggered potential and interactions
Samudra Sur, Diptiman Sen
We study the effects of a periodically driven electric field applied to a variety of tight-binding models in one dimension. We first consider a non-interacting system with or witho…