Physics

Synopsis: Diamond Qubits Take the Stage

September 11, 2019

A ten-qubit system based mostly on spins in impure diamond achieves coherence instances of over a minute.

Synopsis figure

C. E. Bradley/Delft College of Expertise

Within the international race to construct a quantum laptop, it’s nonetheless unclear what materials will make the very best qubit. Firms have guess on quite a lot of architectures based mostly on trapped ions, impartial atoms, superconducting circuits, and extra. Now, Tim Taminiau of Delft College of Expertise, Netherlands, and colleagues have demonstrated that they’ll manipulate magnetic spins inside diamond into the strong quantum states essential for quantum computing. Of their experiment, they entangle all attainable pairs of a ten-qubit system and produce states by which seven totally different qubits are entangled concurrently. Additionally they present that particular person qubits can retain quantum coherence for as much as 75 s—a document for solid-state programs.

The crew’s multiqubit system relies on a nitrogen-vacancy (NV) heart in diamond—a molecule-like impurity consisting of a nitrogen atom and an atom hole sure collectively within the place of two carbon atoms. The NV heart’s electron spin constitutes the central qubit, whereas the nuclear spins of the nitrogen and surrounding carbon atoms kind the opposite 9 qubits. As a result of the electron spin responds optically, its quantum state may be programmed and browse out rapidly utilizing a laser. Consequently, the researchers use the electron spin of the NV heart as a bus, programming it first after which coupling it to a nuclear spin by means of a magnetic interplay. The nuclear spin, which doesn’t reply optically, reveals longer coherence instances than the electron spin—as much as 75 s—making it higher suited to quantum reminiscence and processing. The researchers plan to scale up this method by becoming a member of a number of ten-qubit modules.

This analysis is printed in Bodily Evaluate X.

–Sophia Chen

Sophia Chen is a contract science author based mostly in Tucson, Arizona.

A Ten-Qubit Strong-State Spin Register with Quantum Reminiscence as much as One Minute

C. E. Bradley, J. Randall, M. H. Abobeih, R. C. Berrevoets, M. J. Degen, M. A. Bakker, M. Markham, D. J. Twitchen, and T. H. Taminiau

Phys. Rev. X 9, 031045 (2019)

Printed September 11, 2019

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Quantum InformationMagnetism

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