Fast Multiqubit Gates through Simultaneous Two-Qubit Gates

Near-term quantum computers are limited by the decoherence of qubits to only being able run low-depth circuits with acceptable fidelity. This severely restricts what algorithms can be compiled and implemented on such devices. One way overcome these limitations is expand available gate set from single- two-qubit gates multi-qubit gates, which entangle three or more in a single step. Here, we show that realized simultaneous application multiple group where at least one qubit involved two gates. Multi-qubit this as fast as, sometimes even faster than, constituent Furthermore, do not require any modification processor, but ready used current quantum-computing platforms. We demonstrate idea for specific cases: controlled-Z iSWAP how resulting relate other well-known through numerical simulations they would work well hardware, reaching fidelities above 99 %. also present schemes using swiftly create large entangled states like Dicke Greenberg-Horne-Zeilinger states.