286 citations · 562 across the 17 of their papers we have counts for
17 papers
Quantum-enhanced sensing in a driven-dissipative system via chiral waveguide
Yan Xi Foo, Saubhik Sarkar, Leong Chuan Kwek +2
Quantum sensors can achieve precision unattainable by classical sensors. However, dissipation coming from interaction with the environment can greatly degrade the performance of qu…
Modular non-Hermitian topology and its application to critical sensing
Saubhik Sarkar, Chiranjib Mukhopadhyay, Abolfazl Bayat
Non-Hermitian topological systems have attracted a lot of research activities in recent times, both theoretically and experimentally, due to their unique physical properties and as…
Enhanced image classification via hybridizing quantum dynamics with classical neural networks
Ruiyang Zhou, Saubhik Sarkar, Sougato Bose +1
The integration of quantum computing and machine learning has emerged as a promising frontier in computational science. We present a hybrid protocol which combines classical neural…
Observation of Criticality-Enhanced Quantum Sensing in Nonunitary Quantum Walks
Lei Xiao, Saubhik Sarkar, Kunkun Wang +2
Quantum physics enables parameter estimation with precisions beyond the capability of classical sensors. Quantum criticality is a key resource for this quantum-enhanced sensing, bu…
Metrological symmetries in singular quantum multi-parameter estimation
George Mihailescu, Saubhik Sarkar, Abolfazl Bayat +2
The theoretical foundation of quantum sensing is rooted in the Cramér-Rao formalism, which establishes quantitative precision bounds for a given quantum probe. In many practical sc…
Noisy Stark probes as quantum-enhanced sensors
Saubhik Sarkar, Abolfazl Bayat
Wannier-Stark localization has been proven to be a resource for quantum-enhanced sensitivity for precise estimation of a gradient field. An extremely promising feature of such prob…
Quantum-enhanced sensing of spin-orbit coupling without fine tuning
Bin Yi, Abolfazl Bayat, Saubhik Sarkar
Spin-orbit coupling plays an important role in both fundamental physics and technological applications. Precise estimation of the spin-orbit coupling is necessary for accurate desi…
Exponentially-enhanced quantum sensing with many-body phase transitions
Saubhik Sarkar, Abolfazl Bayat, Sougato Bose +1
Quantum sensors based on critical many-body systems are known to exhibit enhanced sensing capability. Such enhancements typically scale algebraically with the probe size. Going bey…
Review: Quantum Metrology and Sensing with Many-Body Systems
Victor Montenegro, Chiranjib Mukhopadhyay, Rozhin Yousefjani +4
The main power of quantum sensors is achieved when the probe is composed of several particles. In this situation, quantum features such as entanglement contribute to enhancing the…
Critical non-Hermitian topology induced quantum sensing
Saubhik Sarkar, Francesco Ciccarello, Angelo Carollo +1
Non-Hermitian physics predicts open quantum system dynamics with unique topological features such as exceptional points and the non-Hermitian skin effect. We show that this new par…
Free-Fermionic Topological Quantum Sensors
Saubhik Sarkar, Chiranjib Mukhopadhyay, Abhijeet Alase +1
Second order quantum phase transitions, with well-known features such as long-range entanglement, symmetry breaking, and gap closing, exhibit quantum enhancement for sensing at cri…
Correlations in few two-component quantum walkers on a tilted lattice
Saubhik Sarkar, Tomasz Sowiński
We study the effect of inter-component interactions on the dynamical properties of quantum walkers. We consider the simplest situation of two indistinguishable non-interacting walk…
Characterization of an operational quantum resource in a critical many-body system
Saubhik Sarkar, Chiranjib Mukhopadhyay, Abolfazl Bayat
Quantum many-body systems have been extensively studied from the perspective of quantum technology, and conversely, critical phenomena in such systems have been characterized by op…
Interspecies entanglement with impurity atoms in a lattice gas
Saubhik Sarkar, Suzanne McEndoo, Dominik Schneble +1
The dynamics of impurity atoms introduced into bosonic gases in an optical lattice have generated a lot of recent interest, both in theory and experiment. We investigate to what ex…
Glassy disorder-induced effects in noisy dynamics of Bose-Hubbard and Fermi-Hubbard systems
Saubhik Sarkar, Ujjwal Sen
We address the effects of quenched disorder averaging in the time-evolution of systems of ultracold atoms in optical lattices in the presence of noise, imposed by of an environment…
Signatures of Many-Body Localization in a Controlled Open Quantum System
Henrik P. Lüschen, Pranjal Bordia, Sean S. Hodgman +7
In the presence of disorder, an interacting closed quantum system can undergo many-body localization (MBL) and fail to thermalize. However, over long times even weak couplings to a…
Light scattering and dissipative dynamics of many fermionic atoms in an optical lattice
Saubhik Sarkar, Stephan Langer, Johannes Schachenmayer +1
We investigate the many-body dissipative dynamics of fermionic atoms in an optical lattice in the presence of incoherent light scattering. Deriving and solving a master equation to…