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      Ultrafast hole spin qubit with gate-tunable spin–orbit switch functionality

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          A programmable two-qubit quantum processor in silicon

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            Current rectification by Pauli exclusion in a weakly coupled double quantum dot system.

            We observe spin blockade due to Pauli exclusion in the tunneling characteristics of a coupled quantum dot system when two same-spin electrons occupy the lowest energy state in each dot. Spin blockade only occurs in one bias direction when there is asymmetry in the electron population of the two dots, leading to current rectification. We induce the collapse of the spin blockade by applying a magnetic field to open up a new spin-triplet current-carrying channel.
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              A quantum-dot spin qubit with coherence limited by charge noise and fidelity higher than 99.9%

              The isolation of qubits from noise sources, such as surrounding nuclear spins and spin-electric susceptibility 1-4 , has enabled extensions of quantum coherence times in recent pivotal advances towards the concrete implementation of spin-based quantum computation. In fact, the possibility of achieving enhanced quantum coherence has been substantially doubted for nanostructures due to the characteristic high degree of background charge fluctuations 5-7 . Still, a sizeable spin-electric coupling will be needed in realistic multiple-qubit systems to address single-spin and spin-spin manipulations 8-10 . Here, we realize a single-electron spin qubit with an isotopically enriched phase coherence time (20 μs) 11,12 and fast electrical control speed (up to 30 MHz) mediated by extrinsic spin-electric coupling. Using rapid spin rotations, we reveal that the free-evolution dephasing is caused by charge noise-rather than conventional magnetic noise-as highlighted by a 1/f spectrum extended over seven decades of frequency. The qubit exhibits superior performance with single-qubit gate fidelities exceeding 99.9% on average, offering a promising route to large-scale spin-qubit systems with fault-tolerant controllability.
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                Author and article information

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                Journal
                Nature Nanotechnology
                Nat. Nanotechnol.
                Springer Science and Business Media LLC
                1748-3387
                1748-3395
                January 11 2021
                Article
                10.1038/s41565-020-00828-6
                33432204
                46ff7e02-b0d0-4360-80db-a6205eef18bc
                © 2021

                http://www.springer.com/tdm

                http://www.springer.com/tdm

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