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Author

Ojas Parekh

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3 papers indexed here

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Preprint Oct 2026

Polynomial-time classical and quantum simulation of quantum impurity models

Quantum impurity models are paradigmatic models of interacting quantum matter, as well as key computational primitives for modern electronic-structure methods. They describe a small subsystem of interacting fermions coupled to a large, noninteracting bath. We perform a comprehensive study of the computational complexit...

Jia-Qing Jiang, Nathan Ju, Ojas Parekh et al. · 0 citations
Preprint Oct 2026

Polynomial-time classical and quantum simulation of quantum impurity models

Quantum impurity models are paradigmatic models of interacting quantum matter, as well as key computational primitives for modern electronic-structure methods. They describe a small subsystem of interacting fermions coupled to a large, noninteracting bath. We perform a comprehensive study of the computational complexit...

Jia-Qing Jiang, Nathan Ju, Ojas Parekh et al. · 0 citations
Preprint Sep 2026

Optimal testing of fermionic and bosonic Gaussian states

We study the problem of property testing quantum states: given a pure state $|\psi\rangle$ that either (A) belongs to some class $C$ of pure states, or (B) is $\varepsilon$-far in trace distance from all states in $C$, determine which is the case with high probability. It is known that there exists classes $C$ for whic...

Vishnu Iyer, B. O'Gorman, Ojas Parekh et al. · 1 citation

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