49 citations · 139 across the 26 of their papers we have counts for
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Fermionic non-Gaussianity via computable measures and experimentally accessible bounds
Leela Ganesh Chandra Lakkaraju, Naga Dileep Varikuti, Philipp Hauke
Interacting fermions owe both their non-trivial correlations and their computational power to their departure from Gaussianity. Yet, quantifying that departure geometrically faces…
Disorder-induced quantum Fisher information in topological quantum systems
Advay Burte, Keshav Das Agarwal, Leela Ganesh Chandra Lakkaraju +1
The topological order of the Kitaev toric code is insensitive to disorder in its couplings since all star and plaquette operators commute; consequently, the stabilizer ground-state…
Observable signatures of exceptional points from left-right eigenstate distinction
Leela Ganesh Chandra Lakkaraju, Soumik Bandyopadhyay, Sudipto Singha Roy +1
Non-Hermitian quantum systems exhibit qualitatively distinct physical behavior compared to Hermitian systems, a prime example being spectral singularities known as exceptional poin…
Quantum-enhanced sensing from the interplay of long-range interactions and non-Hermiticity
Keshav Das Agarwal, Tanoy Kanti Konar, Leela Ganesh Chandra Lakkaraju +1
Long-range (LR) quantum spin systems offer promising advantages for quantum information processing and sensing. Here, we investigate parameter estimation in an long-range XX spin m…
Probing non-equilibrium physics through the two-body Bell correlator
Abhishek Muhuri, Tanoy Kanti Konar, Leela Ganesh Chandra Lakkaraju +1
Identifying equilibrium criticalities and phases from the dynamics of a system, known as a dynamical quantum phase transition (DQPT), is a challenging task when relying solely on l…
Genuine multipartite entanglement as a probe of many-body localization in disordered spin chains with Dzyaloshinskii-Moriya interactions
Triyas Sapui, Keshav Das Agarwal, Tanoy Kanti Konar +2
We demonstrate that the quenched average genuine multipartite entanglement (GME) can approach its maximum value in the ergodic phase of a disordered quantum spin model. In contrast…
Critical quantum metrology using non-Hermitian spin model with RT-symmetry
Keshav Das Agarwal, Tanoy Kanti Konar, Leela Ganesh Chandra Lakkaraju +1
The non-Hermitian transverse model with Kaplan-Shekhtman-Entin-Wohlman-Aharony (KSEA) interaction having -symmetry, referred to as model, possesses both…
Constructive impact of Wannier-Stark field on environment-boosted quantum batteries
Animesh Ghosh, Tanoy Kanti Konar, Leela Ganesh Chandra Lakkaraju +1
Using the ground states of the Bose- and Fermi-Hubbard model as the battery's initial state, we demonstrate that using the Wannier-Stark (WS) field for charging in addition to onsi…
Expediting quantum state transfer through the long-range extended XY model
Sejal Ahuja, Tanoy Kanti Konar, Leela Ganesh Chandra Lakkaraju +1
Going beyond short-range interactions, we explore the role of long-range interactions in the extended XY model for transferring quantum states through evolution. In particular, emp…
Floquet driven long-range interactions induce super-extensive scaling in quantum batteries
Stavya Puri, Tanoy Kanti Konar, Leela Ganesh Chandra Lakkaraju +1
Achieving quantum advantage in energy storage and power extraction is a primary objective in the design of quantum-based batteries. We explore how long-range (LR) interactions in c…
Slow decay rate of correlations induced by long-range extended Dzyaloshinskii-Moriya interactions
Tanoy Kanti Konar, Leela Ganesh Chandra Lakkaraju, Aditi Sen De
We examine the impact of long-range Dzyaloshinskii-Moriya (DM) interaction in the extended model on the phase diagram as well as the static and dynamical properties of quantum…
Discovering Factorization Surface of Quantum Spin Chains with Machine Learning
Nakul Aggarwal, Keshav Das Agarwal, Tanoy Kanti Konar +2
Entanglement in quantum many-body systems is required for a variety of quantum information tasks, making it crucial to identify the parameter space in which the ground state is ful…
Dimensional gain in sensing through higher-dimensional quantum spin chain
Shivansh Singh, Leela Ganesh Chandra Lakkaraju, Srijon Ghosh +1
Recent breakthroughs in quantum technology pave the way for extensive utilization of higher-dimensional quantum systems, which outperform their qubit counterparts in terms of capab…
Tradeoff between noise and banding in a quantum adder with qudits
Gaurang Agrawal, Tanoy Kanti Konar, Leela Ganesh Chandra Lakkaraju +1
Quantum addition based on the quantum Fourier transform can be an integral part of a quantum circuit and proved to be more efficient than the existing classical ripple carry adder.…
Quantum resources in Harrow-Hassidim-Lloyd algorithm
Pradeep Kumar, Tanoy Kanti Konar, Leela Ganesh Chandra Lakkaraju +1
Quantum algorithms have the ability to reduce runtime for executing tasks beyond the capabilities of classical algorithms. Therefore, identifying the resources responsible for quan…
Quantum-enhanced sensing with variable-range interactions
Monika Mothsara, Leela Ganesh Chandra Lakkaraju, Srijon Ghosh +1
The typical bound on parameter estimation, known as the standard quantum limit (SQL), can be surpassed by exploiting quantum resources such as entanglement. To estimate the magneti…
Recognizing critical lines via entanglement in non-Hermitian systems
Keshav Das Agarwal, Tanoy Kanti Konar, Leela Ganesh Chandra Lakkaraju +1
The non-Hermitian model exhibits counterintuitive phenomena that are not observed in the Hermitian counterparts. To probe the competition between non-Hermitian and Hermitian intera…
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…
Predicting topological quantum phase transition from dynamics via multisite entanglement
Leela Ganesh Chandra Lakkaraju, Sudip Kumar Haldar, Aditi Sen De
An exactly solvable Kitaev model in a two-dimensional square lattice exhibits a topological quantum phase transition which is different from the symmetry-breaking transition at zer…
Detecting exceptional points through dynamics in non-Hermitian systems
Keshav Das Agarwal, Tanoy Kanti Konar, Leela Ganesh Chandra Lakkaraju +1
Non-Hermitian rotation-time reversal (RT)-symmetric spin models possess two distinct phases, the unbroken phase in which the entire spectrum is real and the broken phase which cont…
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…
Quantum battery with non-Hermitian charging
Tanoy Kanti Konar, Leela Ganesh Chandra Lakkaraju, Aditi Sen De
We propose a design of a quantum battery exploiting the non-Hermitian Hamiltonian as a charger. In particular, starting with the ground or the thermal state of the interacting (non…
Predicting Critical Phases from Entanglement Dynamics in XXZ Alternating Chain
Keshav Das Agarwal, Leela Ganesh Chandra Lakkaraju, Aditi Sen De
The quantum XXZ spin model with alternating bond strengths under magnetic field has a rich equilibrium phase diagram which includes Haldane, Luttinger liquid, singlet, and paramagn…
Detection of unbroken phase of non-Hermitian system via Hermitian factorization surface
Leela Ganesh Chandra Lakkaraju, Aditi Sen De
In the traditional quantum theory, one-dimensional quantum spin models possess a factorization surface where the ground states are fully separable having vanishing bipartite as wel…