Local qubit operations in global fields via potential modulation
Abstract
To date, individual addressing of ion qubits has relied on local Rabi or transition frequency differences between ions created via electromagnetic field spatial gradients or via ion transport operations. Alternatively, it is possible in principle to synthesize arbitrary local one-qubit gates by applying local phase differences in the driving field, an idea which has been demonstrated only for ions in widely separated potentials. Here, we propose to implement such phase shifts on two or more ions co-trapped within the same potential well. By dynamically relaxing, tightening, and shifting the axial trap potential we will move the ions to different phase fronts within a shared laser field. We propose a three-year research plan developing this technique and implementing a universal gate set. In the first year, we will characterize phase control of a single 40-Ca+ ion using the proposed scheme, simultaneously perform Ramsey experiments on two ions within a single potential well, and demonstrate one-qubit randomized benchmarking on the two ions. In the second year, we will use local phase control to implement full two-qubit randomized benchmarking on the two ions. The third year will conclude with a demonstration of a three-ion Toffoli gate and with the performance of the quantum Fourier transform algorithm on a minimum of three ions in a single potential well. This will serve as a demonstration of the gate and potential modulation sequence scheduling developed for the effort.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Feb 14, 2019
- Source ID
- W911NF1810166
Entities
People
- Christopher M Seck
Organizations
- Army Contracting Command
- Georgia Tech Applied Research Corporation
- National Security Agency