title: Efficient universal leakage elimination for physical and encoded qubits.
abstract: Decoherence-induced leakage errors can couple a physical or encoded qubit to other levels, thus potentially damaging the qubit. They can therefore be very detrimental in quantum information processing and require special attention. Here we present a general method for removing such errors by using simple decoupling and recoupling pulse sequences. The proposed gates are experimentally accessible in a variety of promising quantum-computing proposals.
authors.affiliation: Chemical Physics Theory Group, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada.
authors.forename: L-A
authors.initials: LA
authors.lastname: Wu
authors.forename: M S
authors.initials: MS
authors.lastname: Byrd
authors.forename: D A
authors.initials: DA
authors.lastname: Lidar