Time-optimal control by a quantum actuator
Author(s)
Aiello, Clarice Demarchi; Cappellaro, Paola
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Indirect control of qubits by a quantum actuator has been proposed as an appealing strategy to manipulate qubits that couple only weakly to external fields. While universal quantum control can be easily achieved when the actuator-qubit coupling is anisotropic, the efficiency of this approach is less clear. Here we analyze the time efficiency of quantum actuator control. We describe a strategy to find time-optimal control sequences by the quantum actuator and compare their gate times with direct driving, identifying regimes where the actuator control performs faster. As a paradigmatic example, we focus on a specific implementation based on the nitrogen-vacancy center electronic spin in diamond (the actuator) and nearby [superscript 13]C nuclear spins (the qubits).
Date issued
2015-04Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Department of Nuclear Science and Engineering; Massachusetts Institute of Technology. Research Laboratory of ElectronicsJournal
Physical Review A
Publisher
American Physical Society
Citation
Aiello, Clarice D., and Paola Cappellaro. "Time-optimal control by a quantum actuator." Phys. Rev. A 91, 042340 (April 2015). © 2015 American Physical Society
Version: Final published version
ISSN
1050-2947
1094-1622