Hi all,

this week Conrad Haupt will tell us about “Digital Quantum Simulation of Dissipative Quantum Systems”.

See below for the abstract.

The talk will take place at 14:00 in HIT E41.1.

Best,

Ladina

Title: Digital Quantum Simulation of Dissipative Quantum Systems

Abstract:

The study of materials using quantum models is a promising application of quantum computers, as

the underlying mechanics are quantum in nature. However, many quantum models of interest include 

dissipative dynamics, which make their simulation on quantum computers more complex. In this work, 

we look at techniques for simulating dissipative quantum models on digital quantum

computers, including dissipation using mid-circuit resets and unitary approximations to interacting baths.

The core of our work is in the digital quantum simulation of magnetisation batteries, which

model interaction spin baths; exploring spin-currents in a one-dimensional Heisenberg chain.

Furthermore, we investigate the impact of new classical-quantum techniques for reducing the

impact of hardware noise on expectation value measurements, called observable backpropagation,

and a simple error mitigation technique involving noise deconvolution.

We quantify their impact on the error in measured expectation values, for various realisations

of the Trotter-Suzuki decomposition, in combination with Multi-Product Formulas to reduce the

Trotter error. Subsequently, we estimate the improvements to existing quantum computers necessary to simulate

the time-evolution for larger system sizes and longer evolution times; which have been

classically simulated with tensor-network methods.