High Fidelity Control of an Multi-Ion Register
Abstract
Quantum information processing (QIP) relies on high fidelity control of complex quantum sys- tems. Arrays of trapped ions are a leading candidate due to the innate all-to-all connectivity of the qubits and long coherence times which enable complicated simulation and gate-based compu- tation. However, these rich dynamics cannot be accessed without reconfigurable gates across an ion register and small electric and magnetic field noise. Our laboratory has pioneered the scientific understanding and reduction of motional heating due to electric field noise, but so far has not put the infrastructure in place to scale up to high fidelity control of a multi-ion quantum processor. Here, we propose to upgrade an existing ion trap apparatus to a small scale quantum information processing device by adding a novel innovative reconfigurable single-ion addressing unit as well as a magnetic shield to improve coherence times. The apparatus features already a custom developed ion gun for surface treatment which does not impede optical access. We hope to improve both motional as well as electronic coherence of 40Ca+ -ions in a Sandia HOA 2.1 trap to 100 ms and beyond. We expect that this rare combination of long coherence times in a scalable room temperature surface trap with multi-qubit control will allow single- and multi-qubit operations on strings of tens of ions with fidelities in the range of 0.999 and above. This would enable studies of efficient calibration of ion trap quantum computers, methods to extend coherence times using auxillary ions, parameter estimation for multi-qubit systems, and certification of quantum processes.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jun 25, 2021
- Source ID
- W911NF2110082
Entities
People
- Hartmut Haeffner
Organizations
- Army Contracting Command
- United States Army
- University of California, Berkeley