78 citations · 305 across the 21 of their papers we have counts for
21 papers
A hybrid-qudit representation of digital RGB images
Sreetama Das, Filippo Caruso
Quantum image processing is an emerging topic in the field of quantum information and technology. In this paper, we propose a new quantum image representation of RGB images, which…
Experimental quantum pattern recognition in IBMQ and diamond NVs
Sreetama Das, Jingfu Zhang, Stefano Martina +2
One of the most promising applications of quantum computing is the processing of graphical data like images. Here, we investigate the possibility of realizing a quantum pattern rec…
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…
Concept of orbital entanglement and correlation in quantum chemistry
Lexin Ding, Sam Mardazad, Sreetama Das +4
A recent development in quantum chemistry has established the quantum mutual information between orbitals as a major descriptor of electronic structure. This has already facilitate…
Resource theory of quantum coherence with probabilistically non-distinguishable pointers and corresponding wave-particle duality
Chirag Srivastava, Sreetama Das, Ujjwal Sen
One of the fundamental features of quantum mechanics is the superposition principle, a manifestation of which is embodied in quantum coherence. Coherence of a quantum state is inva…
Population inversion and entanglement in single and double glassy Jaynes-Cummings models
Ahana Ghoshal, Sreetama Das, Aditi Sen De +1
We find that a suppression of the collapse and revival of population inversion occurs in response to insertion of Gaussian quenched disorder in atom-cavity interaction strength in…
Beating detection loophole in nonlinear entanglement witnesses
Kornikar Sen, Sreetama Das, Ujjwal Sen
Detectors in the laboratory are often unlike their ideal theoretical cousins. They have non-ideal efficiencies, which may then lead to non-trivial implications. We show how it is p…
Nearly Markovian maps and entanglement-based bound on corresponding non-Markovianity
Sreetama Das, Sudipto Singha Roy, Samyadeb Bhattacharya +1
We identify a set of dynamical maps of open quantum system, and refer to them as "-Markovian" maps. It is constituted of maps which, in a higher dimensional system-environment…
Signaling versus distinguishing different superpositions of same pure quantum state
Chirag Srivastava, Sreetama Das, Aditi Sen De +1
Different ensembles of quantum states can have the same average nonpure state. Distinguishing between such constructions, via different mixing procedures of the same nonpure quantu…
Quantum Process Randomness
Sreetama Das, Asutosh Kumar, Aditi Sen De +1
We study the optimization of any quantum process by minimizing the "randomness" in the measurement result at the output of that quantum process. We conceptualize and propose a meas…
Quantifying the particle aspect of quantum systems
Sreetama Das, Indranil Chakrabarty, Arun Kumar Pati +2
The possibility of a quantum system to exhibit properties that are akin to both the classically held notions of being a particle and a wave, is one of the most intriguing aspects o…
Interference-induced localization in quantum random walk on clean cyclic graph
Jayanth Jayakumar, Sreetama Das, Aditi Sen De +1
We quantitatively differentiate between the spreads of discrete-time quantum and classical random walks on a cyclic graph. Due to the closed nature of any cyclic graph, there is ad…
Partial coherence and quantum correlation with fidelity and affinity distances
Chunhe Xiong, Asutosh Kumar, Minyi Huang +3
A fundamental task in any physical theory is to quantify certain physical quantity in a meaningful way. In this paper we show that both fidelity distance and affinity distance sati…
Protocol for unambiguous quantum state discrimination using quantum coherence
Sunho Kim, Longsuo Li, Asutosh Kumar +5
Roa et al. showed that quantum state discrimination between two nonorthogonal quantum states does not require quantum entanglement but quantum dissonance only. We find that quantum…
Inhibition of spreading in quantum random walks due to quenched Poisson-distributed disorder
Sreetama Das, Shiladitya Mal, Aditi Sen De +1
We consider a quantum particle (walker) on a line who coherently chooses to jump to the left or right depending on the result of toss of a quantum coin. The lengths of the jumps ar…
Adiabatic freezing of entanglement with insertion of defects in a one-dimensional Hubbard model
Sreetama Das, Sudipto Singha Roy, Himadri Shekhar Dhar +3
We report on ground state phases of a doped one-dimensional Hubbard model, which for large onsite interactions is governed by the - Hamiltonian, where the extant entanglement…
Wave-particle duality employing quantum coherence in superposition with non-orthogonal pointers
Sreetama Das, Chiranjib Mukhopadhyay, Sudipto Singha Roy +3
We propose the notion of quantum coherence for superpositions over states which are not necessarily mutually orthogonal. This anticipatedly leads to a resource theory of non-orthog…
The separability versus entanglement problem
Sreetama Das, Titas Chanda, Maciej Lewenstein +3
We present a review of the problem of finding out whether a quantum state of two or more parties is entangled or separable. After a formal definition of entangled states, we presen…
Effects of cavity-cavity interaction on the entanglement dynamics of a generalized double Jaynes-Cummings model
Mahasweta Pandit, Sreetama Das, Sudipto Singha Roy +2
We consider a generalized double Jaynes-Cummings model consisting of two isolated two-level atoms, each contained in a lossless cavity, with the cavities interacting with each othe…
Necessarily transient quantum refrigerator
Sreetama Das, Avijit Misra, Amit Kumar Pal +2
We show that one can construct a quantum absorption refrigerator that provides refrigeration only in the transient regime, by using three interacting qubits, each of which is also…
The separability versus entanglement problem
Aditi Sen De, Ujjwal Sen, Maciej Lewenstein +1
We review the problem of discriminating entangled states from separable states for bipartite systems. We formally define what entangled states are, present some important criteria…