Ahead of Nvidia’s first GTC Quantum Day, a group of four quantum stocks were down by an average of 7.1% in midday trading. Worst hit is D-Wave Quantum, down 9.5%. The group also includes Rigetti Computing,

Other companies are leveraging different ways to corral quantum power. Quantinuum Inc., which is majority-owned by Honeywell International Inc., and IonQ Inc. use trapped ions or charged atoms as qubits. That enables the firms to link them together as a base circuit and carry out computer operations.