74 citations · 326 across the 38 of their papers we have counts for
38 papers
Non-Kolmogorov-Arnold-Moser Quantum Sensors for Quantum Parameter Estimation
Naga Dileep Varikuti, Sourav Manna, Athreya Shankar +2
Non-KAM (Kolmogorov-Arnold-Moser) systems, when subjected to weak time-dependent perturbations, exhibit an abrupt transition to classical chaos through the breakdown of invariant p…
Quantum-enhanced single and multiparameter metrology in qutrit ensembles by generalized twisting dynamics
Deep Datta, Sayam Chakraborty, John Drew Wilson +2
Quantum-enhanced sensing with atomic ensembles has predominantly focused on qubit-based protocols, despite the growing ability of many experimental platforms to coherently control…
Programmable coherent site-selective spin control in rotating Penning-trap ion crystals
Nihar Makadia, Julian Y. Z. Jee, Gustavo Café de Miranda +4
Large ion crystals in Penning traps provide a platform for quantum simulation and sensing with hundreds of spins, but their continuous rigid-body rotation has so far limited flexib…
Quantum Beam-Splitter Cooling and Thermometry in Large Trapped-Ion Crystals
Kirthik Rajakumar, Ansh Das, Abhinay Pandey +1
We propose and characterize a protocol for rapid near-ground state cooling of the center-of-mass (c.m.) mode of a large trapped ion crystal. When the initial mean thermal occupatio…
Dynamical aspects of steady-state subradiance: Detailed balance and its breakdown
Athreya Shankar, Simon B. Jäger, Jarrod T. Reilly +3
The dynamics of dissipative many-body quantum systems sometimes admit an emergent classical description in terms of a Markov chain even though the corresponding state space contain…
Experimental realisation of topological spin textures in a Penning trap
Julian Y. Z. Jee, Nihar Makadia, Joseph H. Pham +4
Quantum simulation with controllable many-body platforms offers a powerful route to exploring complex phases and dynamics that are difficult to access in natural materials. Among t…
Optimizing Doppler laser cooling protocols for quantum sensing with 3D ion crystals in a Penning trap
John Zaris, Wes Johnson, Athreya Shankar +4
Large, 3D trapped ion crystals offer improved sensitivity in quantum sensing protocols, and are expected to be implemented as platforms in near-future experiments. However, numeric…
Many-Body Effects in Dark-State Laser Cooling
Muhammad Miskeen Khan, David Wellnitz, Bhuvanesh Sundar +6
We develop a unified many-body theory of two-photon dark-state laser cooling, the workhorse for preparing trapped ions close to their motional quantum ground state. For ions with a…
Collective Vibronic Cascade in Cavity-Coupled Jahn-Teller Active Molecules
Suraj Kumar Pandit, Abhinay Pandey, Athreya Shankar +1
We study the polaritonic states and dynamics of multiple Jahn-Teller (JT) active molecules coupled to the modes of a Fabry-Perot cavity. We find that collective effects dramaticall…
Optimal Displacement Sensing with Spin-Dependent Squeezed States
Liam J. Bond, Christophe H. Valahu, Athreya Shankar +2
Displacement sensing is a fundamental task in metrology. However, the development of quantum-enhanced sensors that fully utilize the available degrees of freedom in many-body quant…
Parametric Amplification of Spin-Motion Coupling in Three-Dimensional Trapped-Ion Crystals
Samarth Hawaldar, N. Nikhil, Ana Maria Rey +2
Three-dimensional (3D) crystals offer a route to scale up trapped ion systems for quantum sensing and quantum simulation applications. However, engineering coherent spin-motion cou…
Adiabatic Cooling of Planar Motion in a Penning Trap Ion Crystal to Sub-Millikelvin Temperatures
Wes Johnson, Bryce Bullock, Athreya Shankar +3
Two-dimensional planar ion crystals in a Penning trap are a platform for quantum information science experiments. However, the low-frequency planar modes of these crystals are not…
Impedance-Engineered Josephson Parametric Amplifier with Single-Step Lithography
Lipi Patel, Samarth Hawaldar, Aditya Panikkar +2
We present the experimental demonstration of an impedance-engineered Josephson parametric amplifier (IEJPA) fabricated in a single-step lithography process. Impedance engineering i…
Multilevel Electromagnetically Induced Transparency Cooling
Katya Fouka, Athreya Shankar, Ting Rei Tan +1
Electromagnetically Induced Transparency (EIT) cooling is a well-established method for preparing trapped ion systems in their motional ground state. However, isolating a three-lev…
Lieb-Mattis states for robust entangled differential phase sensing
Raphael Kaubruegger, Diego Fallas Padilla, Athreya Shankar +9
We explore a two-node, entanglement-enhanced sensor network for differential phase sensing that exploits decoherence-free subspaces to suppress common-mode noise, a primary limitat…
Scalable High-Dimensional Multipartite Entanglement with Trapped Ions
Harsh Vardhan Upadhyay, Sanket Kumar Tripathy, Ting Rei Tan +2
We propose a protocol for the preparation of generalized Greenberger-Horne-Zeilinger (GHZ) states of atoms each with or internal levels. We generalize the celebrated…
Numerical Simulations of 3D Ion Crystal Dynamics in a Penning Trap using the Fast Multipole Method
John Zaris, Wes Johnson, Athreya Shankar +2
We simulate the dynamics, including laser cooling, of 3D ion crystals confined in a Penning trap using a newly developed molecular dynamics-like code. The numerical integration of…
Quantum Synchronization and Dissipative Quantum Sensing
Gaurav M. Vaidya, Simon B. Jäger, Athreya Shankar
We study the phenomenon of quantum synchronization from the viewpoint of quantum metrology. By interpreting quantum self-sustained oscillators as dissipative quantum sensors, we de…
Optimal Multiparameter Metrology: The Quantum Compass Solution
Denis V. Vasilyev, Athreya Shankar, Raphael Kaubruegger +1
We study optimal quantum sensing of multiple physical parameters using repeated measurements. In this scenario, the Fisher information framework sets the fundamental limits on sens…
Bilayer crystals of trapped ions for quantum information processing
Samarth Hawaldar, Prakriti Shahi, Allison L. Carter +3
Trapped ion systems are a leading platform for quantum information processing, but they are currently limited to 1D and 2D arrays, which imposes restrictions on both their scalabil…
Rapid cooling of the in-plane motion of two-dimensional ion crystals in a Penning trap to millikelvin temperatures
Wes Johnson, Athreya Shankar, John Zaris +2
We propose a highly feasible technique with no experimental overhead to rapidly cool the in-plane degrees of freedom of large two-dimensional ion crystals in Penning traps. Through…
Exploring Quantum Synchronization with a Composite Two-Qubit Oscillator
Gaurav M. Vaidya, Arvind Mamgain, Samarth Hawaldar +4
Synchronization has recently been explored deep in the quantum regime with elementary few-level quantum oscillators such as qudits and weakly pumped quantum Van der Pol oscillators…
Optimal and Variational Multi-Parameter Quantum Metrology and Vector Field Sensing
Raphael Kaubruegger, Athreya Shankar, Denis V. Vasilyev +1
We study multi-parameter sensing of 2D and 3D vector fields within the Bayesian framework for quantum interferometry. We establish a method to determine the optimal quantum…
Characterising Polariton States in Non-Dispersive Regime of Circuit Quantum Electrodynamics
Arvind Mamgain, Samarth Hawaldar, Athreya Shankar +1
A superconducting qubit coupled to a read-out resonator is currently the building block of multiple quantum computing as well as quantum optics experiments. A typical qubit-resonat…