224 citations · 467 across the 20 of their papers we have counts for
20 papers
Scaling of Quantum Resources for Simulating a Long-Range System
Tanya Keshari, Debasis Sadhukhan
We simulate a long-range extended Ising model in one dimension using a hybrid quantum algorithm, namely Variational Quantum Eigensolver (VQE). In this quantum simulation, we invest…
Scaling of entanglement entropy and correlations in the variable-range extended Ising model
Harikrishnan K J, Debasis Sadhukhan, Amit Kumar Pal
We study the two-point correlation functions and the bipartite entanglement in the ground state of the exactly-solvable variable-range extended Ising model of qubits in the presenc…
Restricted Randomized Benchmarking with Universal Gates of Fixed Sequence Length
Mohsen Mehrani, Kasra Masoudi, Rawad Mezher +2
The standard randomized benchmarking protocol requires access to often complex operations that are not always directly accessible. Compiler optimization does not always ensure equa…
Framework of dynamical transitions from long-range to short-range quantum systems
Leela Ganesh Chandra Lakkaraju, Srijon Ghosh, Debasis Sadhukhan +1
A quantum many-body system undergoes phase transitions of distinct species with variations of local and global parameters. We propose a framework in which a dynamical quantity can…
Simplifying errors by symmetry and randomisation
James Mills, Debasis Sadhukhan, Elham Kashefi
We present a set of methods to generate less complex error channels by quantum circuit parallelisation. The resulting errors are simplified as a consequence of their symmetrisation…
Mimicking quantum correlation of a long-range Hamiltonian by finite-range interactions
Leela Ganesh Chandra Lakkaraju, Srijon Ghosh, Debasis Sadhukan +1
The quantum long-range extended Ising model possesses several striking features that cannot be observed in the corresponding short-range model. We report that the pattern obtained…
Is there a correlation length in a model with long-range interactions?
Debasis Sadhukhan, Jacek Dziarmaga
Considering an example of the long-range Kitaev model, we are looking for a correlation length in a model with long range interactions whose correlation functions away from a criti…
Inhomogeneity induced shortcut to adiabaticity in Ising chains with long-range interactions
Aritra Sinha, Debasis Sadhukhan, Marek M. Rams +1
Driving a homogeneous system across a quantum phase transition in a quench-time generates excitations on wavelengths longer than the Kibble-Zurek (KZ) length $\hatξ\proptoτ_Q…
Sonic horizons and causality in the phase transition dynamics
Debasis Sadhukhan, Aritra Sinha, Anna Francuz +4
A system gradually driven through a symmetry-breaking phase transition is subject to the Kibble-Zurek mechanism (KZM). As a consequence of the critical slowing down, its state cann…
Response of entanglement to annealed vis-à-vis quenched disorder in quantum spin models
Anindita Bera, Debasis Sadhukhan, Debraj Rakshit +2
We investigate bipartite entanglement in random quantum models at equilibrium. Depending on the intrinsic time scales associated with equilibration of the random parameters an…
Phase boundaries in alternating field quantum XY model with Dzyaloshinskii-Moriya interaction: Sustainable entanglement in dynamics
Saptarshi Roy, Titas Chanda, Tamoghna Das +3
We report all phases and corresponding critical lines of the quantum anisotropic transverse XY model with Dzyaloshinskii-Moriya (DM) interaction along with uniform and alternating…
Emergence of entanglement with temperature and time in factorization-surface states
Titas Chanda, Tamoghna Das, Debasis Sadhukhan +3
There exist zero-temperature states in quantum many-body systems that are fully factorized, thereby possessing vanishing entanglement, and hence being of no use as resource in quan…
Quantum discord and its allies: a review
Anindita Bera, Tamoghna Das, Debasis Sadhukhan +3
We review concepts and methods associated with quantum discord and related topics. We also describe their possible connections with other aspects of quantum information and beyond,…
Scale-invariant freezing of entanglement
Titas Chanda, Tamoghna Das, Debasis Sadhukhan +3
We show that bipartite entanglement in a one-dimensional quantum spin model undergoing time-evolution under local Markovian environments can be frozen over time. We demonstrate thi…
Static and dynamical quantum correlations in phases of an alternating field XY model
Titas Chanda, Tamoghna Das, Debasis Sadhukhan +3
We investigate the static and dynamical patterns of entanglement in an anisotropic XY model with an alternating transverse magnetic field, which is equivalent to a two-component on…
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…
Reducing Computational Complexity of Quantum Correlations
Titas Chanda, Tamoghna Das, Debasis Sadhukhan +3
We address the issue of reducing the resource required to compute information-theoretic quantum correlation measures like quantum discord and quantum work deficit in two qubits and…
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…
Thermal Fluctuations Enhance Order-from-Disorder of Quantum Correlations in Quenched Disordered Spin Models
Debasis Sadhukhan, R. Prabhu, Aditi Sen De +1
We consider paradigmatic quenched disordered quantum spin models, viz., the XY spin glass and random-field XY models, and show that quenched averaged quantum correlations can exhib…
Beating no-go theorems by engineering defects in quantum spin models
Debasis Sadhukhan, Sudipto Singha Roy, Debraj Rakshit +2
There exist diverse no-go theorems, ranging from no-cloning to monogamies of quantum correlations and Bell inequality violations, which restrict the processing of information in th…