Freiburg 2019 – scientific programme
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FM: Fall Meeting
FM 18: Quantum Networks: Interfaces & Hybrid Systems
FM 18.5: Talk
Monday, September 23, 2019, 17:45–18:00, 1015
Simple smooth pulses for fast dispersive cavity and network measurements — •Felix Motzoi1, Lukas Buchmann1, and Christian Dickel2 — 1Aarhus University — 2Kavli Institute of Nanoscience, Delft University of Technology,
We demonstrate a quantum non-demolition measurement pulse shaping technique that allows for arbitrarily fast dispersive, single-quadrature measurements using cavities and quantum networks. For single-qubits, current cQED measurements are limited to the 99% fidelity range due to relaxation for long durations, traded off with cavity leakage at shorter times. These effects can be suppressed using simple smooth readout shapes, related to unitary DRAG transmon pulses. Here, an exact open-system solution is found for arbitrarily many measurement modes, network elements, and mea- sured states. It also generalizes to any linear measurement apparatus, and maximizes efficiency by retaining information in a single field quadrature. Beyond single cavities, the technique generalizes to more complex networks, such as using Purcell filter cavities (where depopulating is a major chal- lenge), cascaded cavity systems (e.g for fast remote entanglement generation), continuous-variable field operations, or (non-dispersive) single-photon networks.