Quantum control methods for robust entanglement of trapped ions
Abstract
A major obstacle in the way of practical quantum computing is achieving scalable and robust high-fidelity entangling gates. To this end, quantum control has become an essential tool, as it can make the entangling interaction resilient to sources of noise. Nevertheless, it may be difficult to identify an appropriate quantum control technique for a particular need given the breadth of work pertaining to robust entanglement. To this end, we attempt to consolidate the literature by providing a non-exhaustive summary and critical analysis. The quantum control methods are separated into two categories: schemes which extend the robustness to (i) spin or (ii) motional decoherence. We choose to focus on extensions of the σ x ⊗ σ x Mølmer–Sørensen interaction using microwaves and a static magnetic field gradient. Nevertheless, some of the techniques discussed here can be relevant to other trapped ion architectures or physical qubit implementations. Finally, we experimentally realize a proof-of-concept interaction with simultaneous robustness to spin and motional decoherence by combining several quantum control methods presented in this manuscript.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 27, 2022
- Source ID
- 10.1088/1361-6455/ac8eff
Entities
People
- C. H. Valahu
- I Apostolatos
- Sebastian Weidt
- Winfried K. Hensinger
Organizations
- Army Research Office
- Engineering and Physical Sciences Research Council
- Horizon 2020
- Office of Naval Research Global