233 citations · 549 across the 13 of their papers we have counts for
13 papers
Parameter-optimal unitary synthesis with flag decompositions
Korbinian Kottmann, David Wierichs, Guillermo Alonso-Linaje +1
We introduce the flag decomposition as a central tool for unitary synthesis. It lets us carve out a diagonal unitary with degrees of freedom in such a way that the remaining…
Unitary synthesis with optimal brick wall circuits
David Wierichs, Korbinian Kottmann, Nathan Killoran
We present quantum circuits with a brick wall structure using the optimal number of parameters and two-qubit gates to parametrize , and provide evidence that these circuit…
Multicritical dissipative phase transitions in the anisotropic open quantum Rabi model
Guitao Lyu, Korbinian Kottmann, Martin B. Plenio +1
We investigate the nonequilibrium steady state of the anisotropic open quantum Rabi model, which exhibits first-order and second-order dissipative phase transitions upon varying th…
Reducing Entanglement With Physically-Inspired Fermion-To-Qubit Mappings
Teodor Parella-Dilmé, Korbinian Kottmann, Leonardo Zambrano +3
In ab-initio electronic structure simulations, fermion-to-qubit mappings represent the initial encoding step of the fermionic problem into qubits. This work introduces a physically…
Evaluating analytic gradients of pulse programs on quantum computers
Korbinian Kottmann, Nathan Killoran
Parametrized pulse programs running on quantum hardware can be differentiated via the stochastic parameter-shift (SPS) rule. We overcome the intrinsically approximate nature of SPS…
Investigating Quantum Many-Body Systems with Tensor Networks, Machine Learning and Quantum Computers
Korbinian Kottmann
We perform quantum simulation on classical and quantum computers and set up a machine learning framework in which we can map out phase diagrams of known and unknown quantum many-bo…