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We discuss the desired criteria for a two-qubit phase gate and present amethod for realising such a gate for quantum computation that ismeasurement-free and low error. The gate is implemented between qubits via anintermediate bus mode. We take a coherent state as the bus and use cross-Kerrtype interactions between the bus and the qubits. This new method is robustagainst parameter variations and is thus low error. It fundamentally improveson previous methods due its deterministic nature and the lack of approximationsused in the geometry of the phase rotations. This interaction is applicableboth to solid state and photonic qubit systems.

Low error measurement-free phase gates for qubus computation