Solid State Quantum Optics
About
In our research group we focus on the study of few-body quantum systems based on spins in solid-state materials toward quantum technology applications.
Research Topics
The interplay of quantum control, environment and measurements is at the heart of open problems in quantum information and quantum sensing, yet not enough is known at present. We investigate this interplay from a theoretical and numerical perspective with a focus on the coherent and dissipative manipulations (protocols) including quantum optimal control, dynamical decoupling and measurement-based protocols.
These protocols are employed in two directions: In many applications the necessary degree of control over the system can be achieved only when the interaction with the environment is mitigated by the control strategy, e.g., to achieve high-fidelity gates for quantum computing. In another scenario, small quantum systems (probes) are employed to extract information on the environment. In this case the role of the control is to encode the relevant information on the environment in the read-out of the probe.
Group members
More about our research
In many cases even a very detailed numerical simulation cannot model faithfully enough a quantum device that has to be optimized. In such cases, measurement feedback is needed in order to design control pulses that steer the device with the desired precision. Together with our experimental collaborators, we use the open-source software Quantum Optimal Control Suite (QuOCS) for measurement-based, closed-loop, pulse optimization.
From a theoretical point of view, we study and design measurement protocols tailored to the experimental setup in order to obtain the most efficient closed-loop optimization protocols.
Selected publications
Gate-set evaluation metrics for closed-loop optimal control on nitrogen-vacancy centerensembles in diamond
Philipp J. Vetter, Thomas Reisser, Maximilian G. Hirsch, Tommaso Calarco, Felix Motzoi, Fedor Jelezko, Matthias M. Müller, Philipp J. Vetter, Thomas Reisser, Maximilian G. Hirsch, Tommaso Calarco, Felix Motzoi
arXiv:2403.00616 (2024), npj Quantum Information 10, 96 (2024) DOI 10.1038
QuOCS: The quantum optimal control suite
Marco Rossignolo, Thomas Reisser, Alastair Marshall, Phila Rembold, Alice Pagano, Philipp J. Vetter, Ressa S. Said, Matthias M. Müller, Felix Motzoi, Tommaso Calarco, Fedor Jelezko, Simone Montangero
Computer Physics Communications 291, 108782 (2023) DOI 10.1016
Information Theoretical Limits for Quantum Optimal Control Solutions: Error Scaling of Noisy Channels
Matthias M. Müller, Stefano Gherardini, Tommaso Calarco, Simone Montangero, Filippo Caruso
arXiv:2006.16113 (2020), Scientific Reports 12 (1), 21405 (2022) DOI 10.1038
One decade of quantum optimal control in the chopped random basis
Matthias M. Müller, Ressa S. Said, Fedor Jelezko, Tommaso Calarco, Simone Montangero
Rep. Prog. Phys. 85, 076001 (2022) DOI 10.1088/1361-6633/ac723c
Introduction to quantum optimal control for quantum sensing with nitrogen-vacancy centers in diamond
Phila Rembold, Nimba Oshnik, Matthias M. Müller, Simone Montangero, Tommaso Calarco, Elke Neu
AVS Quantum Science 2 (2), 024701 (2020) DOI 10.1116/5.0006785