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ACM TechNews

Hybrid Qubits Solve Key Hurdle to Quantum Computing

Hybrid of a two-qubit logic gate for single-spin qubits and a singlet-triplet qubit, realized in a triple quantum dot.

Researchers have built a hybrid device from two different types of quantum bits.

Credit: Akito Noiri et al.

An international team of researchers led by the RIKEN Center for Emergent Matter Science in Japan has built a hybrid device from two different types of quantum bits (qubits) to facilitate rapid initialization and readout, while simultaneously supporting high control fidelity.

The team utilized a single-spin Loss-DiVincenzo qubit, which is in a clear state optimizing it for calculations, and remains in a given state for a relatively long time before losing its signal to the environment.

The researchers combined this with a controlled-phase quantum gate, which allows spin states to be entangled between the qubits sufficiently fast to maintain coherence, enabling readout of the state of the single-spin qubit through fast singlet-triplet qubit measurement.

Said RIKEN's 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."

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Abstracts Copyright © 2019 SmithBucklin, Washington, DC, USA


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