Hello.

I am Hersh Singh, a postdoctoral researcher in theoretical physics at the InQubator for Quantum Simulation at the University of Washington, Seattle. I am also affiliated with the Institute for Nuclear Theory.

I am interested in studies of strongly coupled quantum field theories, with applications to nuclear and high-energy physics, using the powerful tools of lattice field theory, effective field theory and quantum information science.

Before this, I got a

• PhD in Physics from Duke University (2014-2020) working on lattice and effective field theories with Profs. Roxanne Springer and Shaliesh Chandrasekharan, and
• Bachelor’s and Master’s in Electrical Engineering from Indian Institute of Technology Madras (2009-2014), working with Prof. Suresh Govindarajan.

Some of my recent work includes

• qubit regularizations of quantum field theories: with the goal of constructing regularizations of interesting QFTs for the quantum simulation of QFTs
• application of nuclear effective field theory: large-N expansion in two-body systems, and three-body systems
• many of my ongoing projects are around using study aspects of quantum information in QFTs, using worm algorithms and tensor network methods

A complete list of my publications can be found here (or on INSPIRE).

I thoroughly enjoy teaching and always seem to find opportunites to talk about things that I am excited about. During my PhD, I was awarded the Mary Creason Memorial Award for Undergraduate Teaching. I also taught a mini-course on Renormalization Group (Spring 2020, Duke University) for graduate students.

Publications

1. “From asymptotic freedom to θ vacua: Qubit embeddings of the O(3) nonlinear σ model” (2022)
   Stephan Caspar, Hersh Singh
   arXiv:2203.15766
2. “Large-charge conformal dimensions at the O(N) Wilson-Fisher fixed point” (2022)
   Hersh Singh
   arXiv:2203.00059
3. “Space-time symmetric qubit regularization of the asymptotically free two-dimensional O(4) model” (2022)
   Junzhe Zhou, Hersh Singh, Tanmoy Bhattacharya, Shailesh Chandrasekharan, Rajan Gupta
   Phys.Rev.D 105 (2022) 5, 054510
   DOI:10.1103/PhysRevD.105.054510. arXiv:2111.13780
4. “Qubit Regularization of Asymptotic Freedom” (2021)
   Tanmoy Bhattacharya, Alexander J. Buser, Shailesh Chandrasekharan, Rajan Gupta, Hersh Singh
   Phys.Rev.Lett. 126 (2021) 17, 172001
   DOI:10.1103/PhysRevLett.126.172001. arXiv:2012.02153
5. “Qubit regularized $O(N)$ nonlinear sigma models” (2022)
   Hersh Singh
   Phys.Rev.D 105 (2022) 11, 114509
   DOI:10.1103/PhysRevD.105.114509. arXiv:1911.12353
6. “A qubit regularization of the $O(3)$ sigma model” (2019)
   Hersh Singh and Shailesh Chandrasekharan
   Phys. Rev. D 100 (Sept. 2019), p. 054505
   DOI:10.1103/PhysRevD.100.054505. arXiv:1905.13204
7. “Few-body physics on a space-time lattice in the worldline approach” (2019)
   Hersh Singh and Shailesh Chandrasekharan
   Phys. Rev. D 99 (7 Apr. 2019), p. 074511
   DOI:10.1103/PhysRevD.99.074511. arXiv:1812.05080
8. “Worldline approach to few-body physics on the lattice” (2018)
   Hersh Singh
   PoS LATTICE2018(2018), p. 158
   DOI:10.22323/1.334.0158. arXiv:1812.02364
9. “Large-$N_c$ relationships among two-derivative pionless effective field theory couplings” (2018)
   Matthias R. Schindler, Hersh Singh, and Roxanne P. Springer
   Phys. Rev. C 98 (4 Oct. 2018), p. 044001
   DOI:10.1103/PhysRevC.98.044001. arXiv:1805.06056

Recent Talks

1. “From Qubits to Quantum Field Theories”
   Duke Undergraduate Quantum Information Society (April 20, 2022)
   Invited talk
2. “Qubit Regularization of QFTs. From UV to IR: Asymptotic Freedom and Topology”
   Virtual Lattice Field Theory Colloquium (March 17, 2022)
   Colloquium
3. “From Qubits to Quantum Field Theories”
   University of Washington Bothell (November 23, 2021)
   Colloquium
4. “Entanglement harvesting from the vacuum of quantum spin chains”
   Syracuse University - HEP/Cosomology Seminar (Novemeber 15, 2021)
   Invited talk
5. “Entanglement harvesting from the vacuum of quantum spin chains”
   Fall Meeting of the APS Division of Nuclear Physics (DNP) Meeting 2021 (October 13, 2021)
   Contributed talk
6. “Qubit Regularization of Asymptotic Freedom”
   Lattice 2021 (July 26, 2021)
   Contributed talk
   Video | Slides
7. Lectures on “Hamiltonian Time Evolution”
   Quantum Computing Internship for Physics Undergraduates, Fermilab (July 20, 2021)
   Videos: Lecture 1, Lecture 2 | Notes
8. Qubit Regularization of Asymptotic Freedom
   Indian Insitute of Technology Madras – Dual Mysteries of Gauge and Gravity Online Seminar Series (April 19, 2021)
   Invited talk
   Video
9. Qubit Regularization of Asymptotic Freedom
   Brookhaven National Lab (January 4, 2021)
   Invited talk
10. Qubit models and large charge effective field theories
    Fall Meeting of the APS Division of Nuclear Physics (DNP) 2020 (October 31, 2020)
    Contributed talk