Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session P33: Superconducting Parametric/Tunable Interactions
2:30 PM–5:30 PM,
Wednesday, March 7, 2018
LACC Room: 408B
Sponsoring Unit: DQI
Chair: David McKay, IBM T J Watson Res Ctr
Abstract: P33.00011 : Exponential-Off Qubit Couplers
4:54 PM–5:06 PM
Creating qubit-qubit interactions that can be turned on or off is key to making multi-qubit circuits, whether for gate-based or quantum annealing applications. It is critical that the “off” state be robust, both in terms of residual coupling and sensitivity to flux noise. This ensures good isolation of the circuit elements and prevents unwanted terms from being introduced into the Hamiltonian. Here we present an extensible framework for a coupler consisting of a chain of elements connecting two qubits. While the “on” state coupling decreases polynomially in the length of the chain, the unwanted “off” coupling decreases exponentially, leading to a broad range of control flux with negligible “off” coupling for chains of reasonable length. Additionally, the individual elements may be engineered to control aspects of the “on” point, allowing one to mitigate noise or errors in fabrication.
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