Phase-modulated decoupling and error suppression in qubit-oscillator systems
arXiv:1408.2749 · doi:10.1103/PhysRevLett.114.120502
Abstract
We present a scheme designed to suppress the dominant source of infidelity in entangling gates between quantum systems coupled through intermediate bosonic oscillator modes. Such systems are particularly susceptible to residual qubit-oscillator entanglement at the conclusion of a gate period which reduces the fidelity of the target entangling operation. We demonstrate how the exclusive use of discrete phase shifts in the field moderating the qubit-oscillator interaction - easily implemented with modern synthesizers - is sufficient to both ensure multiple oscillator modes are decoupled and to suppress the effects of fluctuations in the driving field. This approach is amenable to a wide variety of technical implementations including geometric phase gates in superconducting qubits and the Molmer-Sorensen gate for trapped ions. We present detailed example protocols tailored to trapped-ion experiments and demonstrate that our approach allows multiqubit gate implementation with a significant reduction in technical complexity relative to previously demonstrated protocols.
Related manuscripts available at http://www.physics.usyd.edu.au/~mbiercuk/Publications.html
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- Robust two-qubit gates in a linear ion crystal using a frequency-modulated driving force
- Fast dynamical decoupling of the Molmer-Sorensen entangling gate
- A functional basis for efficient physical-layer classical control in quantum processors
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