Efficient Two-Qubit Pulse Sequences Beyond CNOT

Understand

We design efficient controlled-rotation gates with arbitrary angle acting on three-spin encoded qubits for exchange-only quantum computation.

• Two pulse sequence constructions are given.
• The first is motivated by an analytic derivation of the efficient Fong-Wandzura sequence for an exact CNOT gate.
• This derivation, briefly reviewed here, is based on elevating short sequences of SWAP pulses to an entangling two-qubit gate.