Description:

Pawan Goswami, PhD Student, Kamal Group

“Dissipation-Incorporated Self-Consistent (DISCo) Quantum Master Equations”

Understanding and harnessing dissipation is an essential cornerstone of current quantum information platforms. The conventional methods of adiabatic elimination used for deriving quantum master equations, however, fall short when applied to scenarios with strong system-reservoir coupling. Here I will describe a new framework called DISCo that extends the adiabatic elimination methods in this regime to include the effects of finite-bandwidth (engineered) reservoirs, routinely employed in circuit-QED-like platforms for readout and reservoir engineering. Notably, DISCo framework was recently deployed for resolution of the long-standing puzzle of qubit lifetime modification during measurement via a dispersively coupled readout resonator [1], as a continuous analogue of the well-known quantum Zeno effect. I will discuss how, in fact, DISCo allows us to predict a broader class of quantum Zeno/anti-Zeno physics accessible via an interplay of dephasing and relaxation dynamics acting on the same system.
[1] T. Thorbeck, Z. Xiao, A. Kamal, and L. C. G. Govia, Readout-induced suppression and enhancement of superconducting qubit lifetimes, Phys. Rev. Lett. 132, 090602 (2024)

Qiaofeng Liu, PhD Student, Low Group

“Quantum Simulation of Nucleon-Nucleon Scattering”

In this talk, I will outline how a classic problem in quantum field theory—two-particle scattering—can be simulated on a quantum computer. Scattering is, at its core, a dynamical process governed by the time evolution of a Hamiltonian, represented by the unitary operator exp(–iHt). After appropriate discretization, this operator is mapped onto a quantum circuit—a composition of basic gates acting on the Hilbert space of qubits—making it suitable for execution on a quantum computer. Varying the evolution time t allows one to study the real-time dynamics of scattering.