596 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Homi Bhabha National InstituteIN8 papers
- Harish-Chandra Research InstituteIN6 papers
- Indian Institute of Technology MadrasIN6 papers
- Tata Institute of Fundamental ResearchIN6 papers
- Indian Institute of Science BangaloreIN5 papers
- Indian Institute of Science Education and Research BerhampurIN5 papers
- Indian Institute of Technology BombayIN5 papers
- Indian Institute of Technology HyderabadIN4 papers
- Joint Institute for Nuclear AstrophysicsUS4 papers
- Centre National de la Recherche ScientifiqueFR3 papers
- Chinese Academy of SciencesCN3 papers
- Institute of Astronomy and Astrophysics, Academia SinicaTW3 papers
25 papers · 1 filter
Floquet thermalization by power-law induced permutation symmetry breaking
Manju C, Uma Divakaran
Permutation symmetry plays a central role in the understanding of collective quantum dynamics. By introducing power law couplings that algebraically decay with the distance between…
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…
Scalable and deterministic Greenberger-Horne-Zeilinger state generation via graph states-assisted measurements
Harikrishnan K J, Amit Kumar Pal
We propose a scalable and deterministic protocol for growing large multi-qubit states starting from two-qubit non-maximally entangled pure states, where the bipartite entanglement…
Recovery of resources through sequential noisy measurements
Sudipta Mondal, Pritam Halder, Amit Kumar Pal +1
Noisy unsharp measurements incorporated in quantum information protocols may hinder performance, reducing the quantum advantage. However, we show that, unlike projective measuremen…
Chaos controlled and disorder driven phase transitions induced by breaking permutation symmetry
Manju C, Arul Lakshminarayan, Uma Divakaran
The effects of disorder and chaos on quantum many-body systems can be superficially similar, yet their interplay has not been sufficiently explored. This work finds a continuous ph…
Entanglement and fidelity across quantum phase transitions in locally perturbed topological codes with open boundaries
Harikrishnan K J, Amit Kumar Pal
We investigate the topological-to-non-topological quantum phase transitions (QPTs) occurring in the Kitaev code under local perturbations in the form of local magnetic field and sp…
The promises and challenges of many-body quantum technologies: a focus on quantum engines
Victor Mukherjee, Uma Divakaran
Can many-body systems be beneficial to designing quantum technologies? We address this question by examining quantum engines, where recent studies indicate potential benefits throu…
Quantum critical engine at finite temperatures
Revathy B S, Victor Mukherjee, Uma Divakaran
We construct a quantum critical Otto engine that is powered by finite temperature baths. We show that the work output of the engine shows universal power law behavior that depends…
Logarithmic growth of peripheral entanglement concentrated via noisy measurements in a star network of spins
Jithin G. Krishnan, Harikrishnan K. J., Amit Kumar Pal
In a star-network of qubits interacting via Heisenberg interaction of XYZ-type, we demonstrate a logarithmic growth of the localizable bipartite peripheral entanglement with increa…
Quantum state transfer using 1D Heisenberg Hamiltonian on quasi-1D lattices
Chandrima B. Pushpan, Harikrishnan K. J., Amit Kumar Pal
We consider transfer of single and multi-qubit states on a quasi-1D lattice, where the time evolutions involved in the state transfer protocol are generated by only 1D Hamiltonians…
Improving Performance of Quantum Heat Engines using modified Otto cycle
Revathy B. S, Harsh Sharma, Uma Divakaran
The efficiency of a quantum heat engine is maximum when the unitary strokes are adiabatic. On the other hand, this may not be always possible due to small energy gaps in the system…
Estimating entanglement in 2D Heisenberg model in the strong rung-coupling limit
Chandrima B. Pushpan, Harikrishnan K. J., Prithvi Narayan +1
In this paper, we calculate entanglement in the isotropic Heisenberg model in a magnetic field on a two-dimensional rectangular zig-zag lattice in the strong rung-coupling limit, u…
Localizing genuine multiparty entanglement in noisy stabilizer states
Harikrishnan K. J., Amit Kumar Pal
Characterizing large noisy multiparty quantum states using genuine multiparty entanglement is a challenging task. In this paper, we calculate lower bounds of genuine multiparty ent…
Bath engineering enhanced quantum critical engines
Revathy B. S., Victor Mukherjee, Uma Divakaran
Driving a quantum system across quantum critical points leads to non-adiabatic excitations in the system. This in turn may adversely affect the functioning of a quantum machine whi…
Controlling gain with loss: Bounds on localizable entanglement in multi-qubit systems
Jithin G. Krishnan, Harikrishnan K. J., Amit Kumar Pal
We investigate the relation between the amount of entanglement localized on a chosen subsystem of a multi-qubit system via local measurements on the rest of the system, and the bip…
Designing refrigerators in higher dimensions using quantum spin models
Tanoy Kanti Konar, Srijon Ghosh, Amit Kumar Pal +1
We design quantum refrigerators based on spin-j quantum XYZ and bilinear-biquadratic models with individual spins attached to bosonic thermal baths. By considering both local and g…
Circulating Genuine Multiparty Entanglement in Quantum Network
Pritam Halder, Ratul Banerjee, Srijon Ghosh +2
We propose a deterministic scheme of generating genuine multiparty entangled states in quantum networks of arbitrary size having various geometric structures -- we refer to it as e…
Distinguishing Phases via Non-Markovian Dynamics of Entanglement in Topological Quantum Codes under Parallel Magnetic Field
Harikrishnan K. J., Amit Kumar Pal
We investigate the static and the dynamical behavior of localizable entanglement and its lower bounds on nontrivial loops of topological quantum codes with parallel magnetic field.…
Designing Robust Quantum Refrigerators in Disordered Spin Models
Tanoy Kanti Konar, Srijon Ghosh, Amit Kumar Pal +1
We explore a small quantum refrigerator in which the working substance is made of paradigmatic nearest-neighbor quantum spin models, the XYZ and the XY model with Dzyaloshinskii-Mo…
Many-body quantum thermal machines
Victor Mukherjee, Uma Divakaran
Thermodynamics of quantum systems and quantum thermal machines are rapidly developing fields, which have already delivered several promising results, as well as raised many intrigu…
Three qubits in less than three baths: Beyond two-body system-bath interactions in quantum refrigerators
Ahana Ghoshal, Sreetama Das, Amit Kumar Pal +2
We show that quantum absorption refrigerators, which have traditionally been studied as of three qubits, each of which is connected to a thermal reservoir, can also be constructed…
Relaxation times do not capture logical qubit dynamics
Amit Kumar Pal, Philipp Schindler, Alexander Erhard +5
Quantum error correction procedures have the potential to enable faithful operation of large-scale quantum computers. They protect information from environmental decoherence by sto…
Universal finite-time thermodynamics of many-body quantum machines from Kibble-Zurek scaling
Revathy B. S., Victor Mukherjee, Uma Divakaran +1
We demonstrate the existence of universal features in the finite-time thermodynamics of quantum machines by considering a many-body quantum Otto cycle in which the working medium i…
Scalable characterization of localizable entanglement in noisy topological quantum codes
David Amaro, Markus Müller, Amit Kumar Pal
Topological quantum error correcting codes have emerged as leading candidates towards the goal of achieving large-scale fault-tolerant quantum computers. However, quantifying entan…