System Using Two Different Types of Qubits Tackles Scalability Issues in Quantum Computing

(Photonics.com) A research team led by the RIKEN Center for Emergent Matter Science (CEMS) has constructed a hybrid device for quantum computing, made from two different types of qubits, each with distinct advantages.
For the study, the scientists implemented a controlled-phase (CPHASE) gate between an LD qubit and an ST qubit in a quantum dot array. This allowed spin states to be entangled between the qubits in a time fast enough to maintain the coherence, allowing the state of the single-spin qubit to be read out by the fast singlet-triplet qubit measurement.
According to researcher Akito Noiri, “With this study we have demonstrated that different types of quantum dots can be combined on a single device to overcome their respective limitations. This offers important insights that can contribute to the scalability of quantum computers.”