923 citations · 2k across the 26 of their papers we have counts for
26 papers
A resource theory of activity for quantum thermodynamics in the absence of heat baths
Swati, Uttam Singh, Giulio Chiribella
Active states, from which work can be extracted by time-dependent perturbations, are an important resource for quantum thermodynamics in the absence of heat baths. Here we characte…
Pointer States in the Born-Markov approximation
Uttam Singh, Adam Sawicki, Jarosław K. Korbicz
Explaining the emergence of classical properties of a quantum system through its interaction with the environment has been one of the promising ideas on how to understand the notor…
Gaussian work extraction from random Gaussian states is nearly impossible
Uttam Singh, Jarosław K. Korbicz, Nicolas J. Cerf
Quantum thermodynamics can be naturally phrased as a theory of quantum state transformation and energy exchange for small-scale quantum systems undergoing thermodynamical processes…
Quantum Depth in the Random Oracle Model
Atul Singh Arora, Andrea Coladangelo, Matthew Coudron +3
We give a comprehensive characterization of the computational power of shallow quantum circuits combined with classical computation. Specifically, for classes of search problems, w…
Quantifying the value of transient voltage sources
Swati, Uttam Singh, Oscar C. O. Dahlsten
Some voltage sources are transient, lasting only for a moment of time, such as the voltage generated by converting a human motion into electricity. Such sources moreover tend to ha…
Oracle separations of hybrid quantum-classical circuits
Atul Singh Arora, Alexandru Gheorghiu, Uttam Singh
An important theoretical problem in the study of quantum computation, that is also practically relevant in the context of near-term quantum devices, is to understand the computatio…
Partial order on passive states and Hoffman majorization in quantum thermodynamics
Uttam Singh, Siddhartha Das, Nicolas J. Cerf
Passive states, i.e., those states from which no work can be extracted via unitary operations, play an important role in the foundations and applications of quantum thermodynamics.…
Quantum thermodynamics in a multipartite setting: A resource theory of local Gaussian work extraction for multimode bosonic systems
Uttam Singh, Michael G. Jabbour, Zacharie Van Herstraeten +1
Quantum thermodynamics can be cast as a resource theory by considering free access to a heat bath, thereby viewing the Gibbs state at a fixed temperature as a free state and hence…
Max- relative entropy of coherence: an operational coherence measure
Kaifeng Bu, Uttam Singh, Shao-Ming Fei +2
The operational characterization of quantum coherence is the corner stone in the development of resource theory of coherence. We introduce a new coherence quantifier based on max-r…
Asymmetry and coherence weight of quantum states
Kaifeng Bu, Namit Anand, Uttam Singh
The asymmetry of quantum states is an important resource in quantum information processing tasks such as quantum metrology and quantum communication. In this paper, we introduce th…
Coherence breaking channels and coherence sudden death
Kaifeng Bu, Swati, Uttam Singh +1
Quantum noise is ubiquitous to quantum systems as they incessantly interact with their surroundings and results in degrading useful resources such as coherence for single quantum s…
Uncertainty Relations for Quantum Coherence
Uttam Singh, Arun Kumar Pati, Manabendra Nath Bera
Coherence of a quantum state intrinsically depends on the choice of the reference basis. A natural question to ask is the following: if we use two or more incompatible reference ba…
Average distance of random pure states from maximally entangled and coherent states
Kaifeng Bu, Uttam Singh, Lin Zhang +1
It is well known that random bipartite pure states are typically maximally entangled within an arbitrarily small error. Showing that the marginals of random bipartite pure states a…
Energy Cost of Creating Quantum Coherence
Avijit Misra, Uttam Singh, Samyadeb Bhattacharya +1
We consider the physical situations where the resource theories of coherence and thermodynamics play competing roles. In particular, we study the creation of quantum coherence usin…
Catalytic coherence transformations
Kaifeng Bu, Uttam Singh, Junde Wu
Catalytic coherence transformations allow the otherwise impossible state transformations using only incoherent operations with the aid of an auxiliary system with finite coherence…
Average subentropy, coherence and entanglement of random mixed quantum states
Lin Zhang, Uttam Singh, Arun Kumar Pati
Compact expressions for the average subentropy and coherence are obtained for random mixed states that are generated via various probability measures. Surprisingly, our results sho…
Average coherence and its typicality for random pure states
Uttam Singh, Lin Zhang, Arun Kumar Pati
We investigate the generic aspects of quantum coherence guided by the concentration of measure phenomenon. We find the average relative entropy of coherence of pure quantum states…
Erasing Quantum Coherence: An Operational Approach
Uttam Singh, Manabendra Nath Bera, Avijit Misra +1
Despite being one of the hallmarks of quantum physics, there is a lack of operational interpretations of quantum coherence. Here we provide an operational interpretation of coheren…
From Rényi Relative Entropic Generalization to Quantum Thermodynamical Universality
Avijit Misra, Uttam Singh, Manabendra Nath Bera +1
It is shown that the structure of thermodynamics is "form invariant", when it is derived using maximum entropy principle for various choices of entropy and even beyond equilibrium.…
Maximally coherent mixed states: Complementarity between maximal coherence and mixedness
Uttam Singh, Manabendra Nath Bera, Himadri Shekhar Dhar +1
Quantum coherence is a key element in topical research on quantum resource theories and a primary facilitator for design and implementation of quantum technologies. However, the re…
Measuring Quantum Coherence with Entanglement
Alexander Streltsov, Uttam Singh, Himadri Shekhar Dhar +2
Quantum coherence is an essential ingredient in quantum information processing and plays a central role in emergent fields such as nanoscale thermodynamics and quantum biology. How…
Measuring Non-Hermitian Operators via Weak Values
Arun Kumar Pati, Uttam Singh, Urbasi Sinha
In quantum theory, a physical observable is represented by a Hermitian operator as it admits real eigenvalues. This stems from the fact that any measuring apparatus that is suppose…
Enhancing robustness of multiparty quantum correlations using weak measurement
Uttam Singh, Utkarsh Mishra, Himadri Shekhar Dhar
Multipartite quantum correlations are important resources for the development of quantum information and computation protocols. However, the resourcefulness of multipartite quantum…
Weak Values with Remote Postselection and Shared Entanglement
Arun Kumar Pati, Uttam Singh
We propose a new protocol for the weak measurement of any observable with remote pre and postselections. We show that if two parties share a pure entangled state, then by using loc…