38 citations · 174 across the 20 of their papers we have counts for
21 papers
Derivations of plane algebroid curves
Sagnik Chakraborty, R. V. Gurjar, Madhuparna Pal
In this paper, we study the derivations of an irreducible plane algebroid curve , which is not regular. Since the normalization of is isomorphic to $k[…
Jaynes-Cummings dynamics in strong coupling for many-interacting-qubit quantum Rabi models
Roberto Grimaudo, Sagnik Chakraborty, Rosario Lo Franco +1
The present work focuses on the strong/weak interaction of many-body spin-systems with a cavity mode. It introduces the necessity of redefining the physical conditions determining…
Efficient Estimation of Multiple Temperatures via a Collisional Model
Srijon Ghosh, Sagnik Chakraborty, Rosario Lo Franco
We present a quantum thermometric protocol for the estimation of multiple temperatures within the collisional model framework. Employing the formalism of multiparameter quantum met…
Three-Photon Saturable Absorption in Atomically Thin Phlogopite
Nabarun Mandal, Sagnik Chakraborty, Ranjeet Singh +10
Two-dimensional (2D) materials, due to their remarkable physical and chemical properties, hold significant potential for future optical and electrical applications. In this study,…
Intrinsic Hamiltonian of Mean Force and Strong-Coupling Quantum Thermodynamics
Ignacio González, Sagnik Chakraborty, Ángel Rivas
We present a universal thermodynamic framework for quantum systems that may be strongly coupled to thermal environments. Unlike previous approaches, our method enables a clear defi…
Recognizing Artificial Minds: A Philosophical Defense of AI Cognition
Herman Cappelen, Josh Dever
This work defends the 'Whole Hog Thesis': sophisticated Large Language Models (LLMs) like ChatGPT are full-blown linguistic and cognitive agents, possessing understanding, beliefs,…
Higher-order phase reduction captures delay-dependent synchronization phenomena in physical oscillator networks
Babette A. J. de Wolff, Sagnik Chakraborty, István Z. Kiss +2
Coupled oscillators with time-delayed network interactions are critical to understand synchronization phenomena in many physical systems. Phase reductions to finite-dimensional pha…
Quantum metrology using quantum combs and tensor network formalism
Stanislaw Kurdzialek, Piotr Dulian, Joanna Majsak +2
We develop an efficient algorithm for determining optimal adaptive quantum estimation protocols with arbitrary quantum control operations between subsequent uses of a probed channe…
Strongly coupled quantum Otto cycle with single qubit bath
Sagnik Chakraborty, Arpan Das, Dariusz Chruściński
We discuss a model of a closed quantum evolution of two-qubits where the joint Hamiltonian is so chosen that one of the qubits acts as a bath and thermalize the other qubit which i…
Thermodynamics and the quantum speed limit in the non-Markovian regime
Arpan Das, Anindita Bera, Sagnik Chakraborty +1
Quantum speed limit (QSL) for open quantum systems in the non-Markovian regime is analyzed. We provide a the lower bound for the time required to transform an initial state to a fi…
Interpolating between positive and completely positive maps: a new hierarchy of entangled states
Katarzyna Siudzińska, Sagnik Chakraborty, Dariusz Chruściński
A new class of positive maps is introduced. It interpolates between positive and completely positive maps. It is shown that this class gives rise to a new characterization of entan…
Eternally non-Markovian dynamics of a qubit interacting with a single-photon wavepacket
Anita Dąbrowska, Dariusz Chruściński, Sagnik Chakraborty +1
An evolution of a two-level system (qubit) interacting with a single-photon wave packet is analyzed. It is shown that a hierarchy of master equations gives rise to phase covariant…
On the Alberti-Uhlmann Condition for Unital Channels
Sagnik Chakraborty, Dariusz Chruściński, Gniewomir Sarbicki +1
We address the problem of existence of completely positive trace preserving (CPTP) maps between two sets of density matrices. We refine the result of Alberti and Uhlmann and derive…
Some results on retracts of polynomial rings
Sagnik Chakraborty, Nikhilesh Dasgupta, Amartya Kumar Dutta +1
In this paper, we first consider the relationship between a polynomial ring over a Noetherian domain and the ring of invariants of a -action on , when…
Information flow versus divisibility for qubit evolution
Sagnik Chakraborty, Dariusz Chruściński
We study the relation between lack of Information Backflow and completely positive divisibility (CP divisibility) for non-invertible qubit dynamical maps. Recently, these two conce…
Quantum precision thermometry with weak measurement
Arun Kumar Pati, Chiranjib Mukhopadhyay, Sagnik Chakraborty +1
As the minituarization of electronic devices, which are sensitive to temperature, grows apace, sensing of temperature with ever smaller probes is more important than ever. Genuinel…
Universal detection of entanglement in two-qubit states using only two copies
Suchetana Goswami, Sagnik Chakraborty, Sibasish Ghosh +1
We revisit the problem of detection of entanglement of an unknown two-qubit state using minimal resources. Using weak values and just two copies of an arbitrary two-qubit state, we…
Generalized formalism for information backflow in assessing Markovianity and its equivalence to divisibility
Sagnik Chakraborty
We present a general framework for the information backflow (IB) approach of Markovianity that not only includes a large number, if not all, of IB prescriptions proposed so far but…
Non-Markovianity of qubit evolution under the action of spin environment
Sagnik Chakraborty, Arindam Mallick, Dipanjan Mandal +2
The question, whether an open system dynamics is Markovian or non-Markovian can be answered by studying the direction of the information flow in the dynamics. In Markovian dynamics…
Quantum ratchet in disordered quantum walk
Sagnik Chakraborty, Arpan Das, Arindam Mallick +1
Symmetrically evolving discrete quantum walk results in dynamic localization with zero mean displacement when the standard evolution operations are replaced by a temporal disorder…
On thermalization of two-level quantum systems
Prathik J Cherian, Sagnik Chakraborty, Sibasish Ghosh
Providing the microscopic behavior of a thermalization process has always been an intriguing issue. There are several models of thermalization, which often requires interaction of…