Aashish Clerk
Contact:
Pritzker School of Molecular Engineering,
University of Chicago,
5640 S. Ellis Ave.,
Chicago, IL, 60631.
Tel: (773) 834 4568
Office: Eckhart 289
email: aaclerk at uchicago.edu

Welcome!

My group is broadly interested in driven-dissipative quantum phenomena occurring in engineered quantum systems. Our research is at the intersection of condensed matter physics, quantum optics, and quantum information. While we are theorists, we work closely with a number of leading experimental groups around the world.



Brief Bio:



Openings, News, Etc.

  • Nov. 2020: U. Chicago news coverage of our work on exponentially-enhanced quantum sensing via non-Hermitian lattices.
  • Oct. 2020: Openings for new postdocs and students (start date September 2021)

Research Interests

  • Driven-dissipative quantum systems
  • Quantum measurement, sensing and metrology
  • Quantum optics and optomechanics
  • Superconducting circuits and qubits

nanoelectro

Effective temperature (possibly negative!) of incoherently tunneling Cooper pairs. Read the paper.


Recent Research Highlights

Topological bosonic states via squeezing

PAT

There is enormous interest in engineering topological photonic systems, where topological protection guarantees the existence of robust edge modes. Most works in this field amount to replicating a well-known fermionic single-particle Hamiltonian. We recently studied a class of systems where this correspondence fails. Here, topology is induced by coherent two-photon driving (i.e. parametric driving). While these systems have a Hamiltonian resembling that of a fermionic topological superconductor, the bosonic physics is completely different. In particular, the topologically-protected edge states can act as frequency-converting channels, and can even serve as quantum-limited amplifiers and squeezed light sources. It is even possible to construct bosonic systems that are reminiscent of the fermionic Kitaev-Majorana chain.

Nature Communications, 2016

Phys. Rev. X, 2016

Phys. Rev. X, 2018

Enhanced light-matter interactions via two-photon driving

negT

We show how two-photon (or parametric) driving can be used to enhance the basic light-matter interaction in a generic cavity QED system, where a two-level atom (or qubit) interacts with photons in a cavity. Driving thus enables a weakly interacting system to behave like a strongly interacting one, and even allows one to reach so-called "ultra-strong" coupling regimes. Applications include the efficient production of highly entangled Schrodinger-cat style states. The effects we predict could be realized in a number of experimental platforms, including with superconducting quantum circuits.

Phys. Rev. Lett., 2018