Multiqubit entangling gates with simultaneous exchange driving in three spin qubit systems

Pairwise exchange couplings have been the standard mechanism for entangling spin qubits in semiconductor systems. However, implementing quantum circuits based on pairwise exchange gates typically requires a long sequence of elementary gate operations. This talk presents multiqubit entangling gate operations with simultaneous driving of the exchange couplings between pairs of spin qubits. This scheme can allow for much shorter quantum circuit implementation for many tasks. We consider three spin qubit systems with two different configurations: a linear arrangement and a triangular arrangement. The exact analytical forms of the three-qubit unitary gates are derived. We show that highly entangled states, like the GHZ and W states, can be efficiently constructed with fewer gates and a smaller circuit depth. We also show that it can efficiently create the Toffoli gate. Our findings demonstrate how multiqubit interactions can be used to improve the performance of quantum circuits, advancing the creation of scalable quantum technology.