SAMOP 2023 – scientific programme
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QI: Fachverband Quanteninformation
QI 6: Poster I (joint session QI/Q)
QI 6.35: Poster
Monday, March 6, 2023, 16:30–19:00, Empore Lichthof
Noise-assisted adiabatic quantum search algorithm: a study via quantum trajectories — •Raphaël Menu1, Christiane P. Koch2, and Giovanna Morigi1 — 1Theoretische Physik, Universität des Saarlandes, D-66123 Saarbr *ucken, Germany — 2Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany
Adiabatic quantum computing offers a precious alternative to quantum circuits for the implementation of quantum search algorithms. Indeed, while circuits require an oracle, namely a black box, to test whether the algorithm converged towards the target state, adiabatic quantum search algorithms performs the calculation via the adiabatic preparation of the ground state of a simple effective two-level system. Yet, such an approach is not flawless since it requires a large annealing time so that transitions out of the ground state are suppressed, and therefore one may reach time scales when the effects of the environment become relevant.
In this work, we study by the means of the framework of quantum trajectories (Monte Carlo wavefunction) the adiabatic implementation of the Grover search algorithm, and investigate how one can improve the performance of the search via the coupling of the computation qubit to an ancilla, leading to a shortest annealing time and a correction of the computational errors.