Poster Session

Poster Session I (4pm-6pm CDT)

4:00 pm – 6:00 pm, Tuesday June 4 // Session D00

Topics:

Refining Motional Control towards Electric-Field Gradient Gates on Molecular Qubits

Poster 77

Presenter: Clayton Z Ho (UCLA)

Authors: Grant Mitts (UCLA), Hao Wu (UCLA), Joshua Rabinowitz (UCLA), Eric Hudson (UCLA)

Electric-Gradient Gates (EGGs) (Phys. Rev. A. 2021, 104, 042605) exploits the rich, microwave-addressable rovibrational structure of molecular ions to encode qubits. Together with a co-trapped atomic ion for sympathetic cooling and ancilla readout, EGGs achieves a complete and laser-free set of quantum logic operations by applying microwaves on trap electrodes.

However, motional control of ions remains a key obstacle towards near-term quantum computation. Particularly, state detection with EGGs involves the application of bichromatic microwave fields to generate state-dependent motional excitation.

To this end, we incorporate a body of quantum control techniques towards robust motional control with EGGs. Importantly, we implement a novel technique for in situ amplitude and phase calibration of qubit signals (arXiv:2311.12263). We integrate these improved control signals with continuous dynamical decoupling and waveform modulation to engineer robust sequences for nondemolition readout and quantum logic spectroscopy. Finally, we leverage parametric quantum amplification (Science. 2019, 364, 1163-1165) and optimal statistical design to ensure high-fidelity motional detection.

Funding acknowledgement

This research was supported by the National Science Foundation (Grants No. 2110421 and No. CHE-1900555), the Army Research Office (Grant No. W911NF-19-1-0297) and the Air Force Office of Surface Research (Grant No. FA9550- 20-1-0323). We acknowledge support from the NSF QLCI program through Grant No. OMA-2016245.

POSTERS (157)