AshishKumarPatra

Quantum Analyst

QClairvoyance Quantum Labs Pvt. Ltd.

• Built and benchmarked a DMET–SQD simulation pipeline for ligand-like molecular Hamiltonians on 20–30 qubits, validated against DMET-FCI reference energies.
• Ran a large-scale experimental study of DMET-SQD with the LUCJ ansatz on IQM’s 24-qubit Sirius superconducting processor (up to 16 operational qubits), estimating chemically accurate ground-state energies across benchmark molecules.
• Developed QSCI-RBM, a compact subspace generation protocol using Restricted Boltzmann Machines within DMET. On a Carmofur–SARS-CoV-2 M^pro protein–ligand complex it reached chemical accuracy with about 4% of the configuration subspace, versus about 20% for standard SQD, which did not reach it.
• Designed a polylogarithmic-time quantum algorithm for the Laplace transform using eigenvalue transformation, and analysed its resource scaling.
• Contributed to VQE resource estimation for small molecules and to a DMET-VQE framework using the COMPASS ansatz for strongly correlated systems.

Machine-Learned Compact Subspace Generation for Quantum Selected Configuration Interaction within Density Matrix Embedding Framework

A. K. Patra, Anurag K. S. V., Ruchika Bhat, Sai Shankar P., Rahul Maitra, Jaiganesh G.

arXiv:2607.20585

Introduces QSCI-RBM and applies it to a Carmofur–M^pro complex, reaching chemical accuracy with about 4% of the configuration subspace.

An Analytically Trained Variational Surrogate for Quantum Phase Estimation on NISQ Hardware

Mousumi Kundu, A. K. Patra, Anurag K. S. V., Ruchika Bhat, Sai Shankar P., Alok Shukla, Jaiganesh G.

arXiv:2607.20943

A shallow variational circuit trained analytically to reproduce QPE measurement distributions for molecular ground-state energies, avoiding the deep circuits direct QPE needs.

Towards Chemically Accurate and Scalable Quantum Simulations on IQM Quantum Hardware: A Quantum-HPC Hybrid Approach

Anurag K. S. V.†, A. K. Patra†, et al. († equal contribution)

arXiv:2604.01983

DMET-SQD with the LUCJ ansatz on IQM’s 24-qubit Sirius processor, with a shot-dependent convergence analysis that sets practical limits for hybrid workflows.

Advancing Practical Quantum Embedding Simulations via Operator Commutativity Based State Preparation for Complex Chemical Systems

Dibyendu Mondal, A. K. Patra, et al.

Chem. Sci. 2026; arXiv:2604.19470

A DMET-VQE embedding framework built on the dynamically constructed COMPASS ansatz for strongly correlated molecular systems.

Fractional Revival Dynamics in Kerr-Type Systems: Angular Momentum Moments and Classical Analogs

A. K. Patra, Saikumar Krithivasan

arXiv:2601.09763

Analytical revival structures from angular momentum moments, with higher-order signatures of nonclassical evolution and their classical phase-space analogs.

A Polylogarithmic-Time Quantum Algorithm for the Laplace Transform

Akash Kumar Singh, A. K. Patra, et al.

arXiv:2512.17980

A poly-log scaling algorithm via eigenvalue transformation, offering a general framework for efficient functional evaluation on quantum computers.

Quantum Simulation of Ligand-like Molecules through Sample-Based Quantum Diagonalization in Density Matrix Embedding Framework

A. K. Patra, et al.

arXiv:2511.22158

A fragment-based DMET-SQD pipeline in strong agreement with DMET-FCI benchmarks for molecular systems of 20–30 qubits.

Survey of Quantum Algorithms: Foundations, Frameworks and Applications

A. K. Patra, et al.

Authorea preprint

Resource Estimation for VQE on Small Molecules: Impact of Fermion Mappings and Hamiltonian ReductionsPeer-reviewed

Anurag K. S. V., A. K. Patra, et al.

Journal of Computational Chemistry

Balanced optical homodyne detection

DIAT, Pune. Guided by Dr. G. Raghavan and Dr. K. Raju Pandiri

• Designed and built a 95%-visibility Mach–Zehnder interferometer to measure weak optical fields at about 10⁻⁵ of the local oscillator, probing the quantum noise floor.
• Reconstructed Wigner functions and density matrices from homodyne statistics, with full state tomography of vacuum and weak coherent states.
• Built a beamsplitter noise model quantifying how decoherence corrupts the interference structure.

Two-qubit photonic tomography

DIAT, Pune. Guided by Dr. K. Srinivasan and Dr. G. Raghavan

• Constructed a β-BBO SPDC source of polarization-entangled photon pairs with about 10% heralding efficiency.
• Performed two-qubit state tomography with maximum-likelihood estimation, and wrote the tools for density matrix reconstruction and entanglement quantification.

Revivals in nonlinear Kerr systems

Loyola College, Chennai. Guided by Mr. Saikumar K. and Mr. Joseph Prabagar

• Derived analytical conditions for revival and fractional revival under the Kerr Hamiltonian, and computed higher-order moments as signatures of nonclassical dynamics.
• Drew quantum carpets to visualise wavepacket dynamics and their classical phase-space correspondences.

B-92 quantum key distribution

Demonstrated the B-92 protocol with free-space single-photon transmission over 3 metres.

M.Tech, Quantum Computing

Defence Institute of Advanced Technology, Pune. CGPA 9.15/10

M.Sc, Physics

Loyola College, Chennai. CGPA 8.44/10

B.Sc, Physics with Computer Applications

D.G. Vaishnav College, Chennai. CGPA 8.7/10

IBM Quantum, IQM Cloud, Qiskit, CUDA-Q, PennyLane, QuTiP

VQE, QAOA, QPE, Trotterization, DMET, SQD, quantum state tomography (MLE), Wigner function reconstruction, error mitigation

Python (advanced), C/C++, MATLAB, JavaScript

LaTeX, Git

English (TOEFL iBT 112/120), Odia (mother tongue), Tamil (fluent), Hindi (fluent)

VQE: Theory and Implementation

Invited talk, Quantum Programming Bootcamp 2026, at QClairvoyance Quantum Labs in association with SVNIT

Balanced Homodyne Detection of CV Quantum States

Poster, ICQTA 2024

High bandwidth homodyne detector development

Poster, OPTOIn 2024

Qutrit

A custom simulation framework for ternary quantum systems, with Deutsch–Jozsa and Simon’s algorithm implemented in a qutrit gate model.

GitHub profile

Fractals in chaos games

Simple rules for placing points generate fractals. A small project inspired by a Mathologer video.

Source

Boids

The complex-looking behaviour of a flock emerges from three simple rules.

Run it Source

Game of Life

Conway’s Game of Life again, learnt from The Coding Train. No customisation yet: pixels coming to life and dying.

Open

Revivals and fractional revivals

A short discussion of revivals and fractional revivals in quantum systems.

Read

Xersei Freid’s Interviews

A B-class personnel’s memoirs of the people they interviewed in an SCP facility.

Read

Staring In

Dr. Henry rushes to Dr. Forder’s laboratory after Dr. Forder makes a groundbreaking discovery.

Read