title: Two-qubit gates for resonant exchange qubits.
abstract: A new approach to single-qubit operations using exchange interactions of single electrons in gate-defined quantum dots has recently been demonstrated: the resonant exchange qubit. We show that two-qubit operations, specifically the controlled phase gate, can be performed between resonant exchange qubits very straightforwardly, using a single exchange pulse. This is in marked contrast to the best known protocols for exchange qubits where such a gate requires many pulses so that leakage processes arising from the exchange interaction can be overcome. For resonant exchange qubits a simple two-qubit gate is possible because in this mode of operation energy conservation suppresses leakage.
authors: Centre for Engineered Quantum Systems, School of Physics, The University of Sydney, Sydney NSW 2006, Australia. andrew.doherty@sydney.edu.au
authors: Andrew C
authors: AC
authors: Doherty
authors: Matthew P
authors: MP
authors: Wardrop