Coherent spin-exchange via a quantum mediator
TLDR
This work uses a linear triple-quantum-dot array to demonstrate a coherent time evolution of two interacting distant spins via a quantum mediator, which may provide a new route for scaling up spin qubit circuits using quantum dots, and aid in the simulation of materials and molecules with non-nearest-neighbour couplings.Abstract:
Coherent interactions at a distance provide a powerful tool for quantum simulation and computation. The most common approach to realize an effective long-distance coupling 'on-chip' is to use a quantum mediator, as has been demonstrated for superconducting qubits and trapped ions. For quantum dot arrays, which combine a high degree of tunability with extremely long coherence times, the experimental demonstration of the time evolution of coherent spin-spin coupling via an intermediary system remains an important outstanding goal. Here, we use a linear triple-quantum-dot array to demonstrate a coherent time evolution of two interacting distant spins via a quantum mediator. The two outer dots are occupied with a single electron spin each, and the spins experience a superexchange interaction through the empty middle dot, which acts as mediator. Using single-shot spin readout, we measure the coherent time evolution of the spin states on the outer dots and observe a characteristic dependence of the exchange frequency as a function of the detuning between the middle and outer dots. This approach may provide a new route for scaling up spin qubit circuits using quantum dots, and aid in the simulation of materials and molecules with non-nearest-neighbour couplings such as MnO (ref. 27), high-temperature superconductors and DNA. The same superexchange concept can also be applied in cold atom experiments.read more
Citations
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Interfacing spin qubits in quantum dots and donors—hot, dense, and coherent
Lieven M. K. Vandersypen,Lieven M. K. Vandersypen,Hendrik Bluhm,James S. Clarke,Andrew S. Dzurak,Ryoichi Ishihara,Andrea Morello,David J. Reilly,Lars R. Schreiber,Menno Veldhorst +9 more
TL;DR: In this article, the authors review several strategies that are considered to address this crucial challenge in scaling quantum circuits based on electron spin qubits. But, the wiring and interconnect requirements for quantum circuits are completely different from those for classical circuits, as individual direct current, pulsed and in some cases microwave control signals need to be routed from external sources to every qubit.
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A coherent spin–photon interface in silicon
TL;DR: Strong coupling between a single spin in silicon and a single microwave-frequency photon, with spin–photon coupling rates of more than 10 megahertz is demonstrated, which opens up a direct path to entangling single spins using microwave- frequencies.
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Semiconductor quantum computation
TL;DR: In this paper, the basic ideas for quantum computing, and then discuss the developments of single and two-qubit gate control in semiconductors are discussed, considering the positive trend of the research on semiconductor quantum devices and recent theoretical work on the applications of quantum computation.
Journal ArticleDOI
Coherent shuttle of electron-spin states
TL;DR: In this article, the authors demonstrate a coherent spin shuttle through a GaAs/AlGaAs quadruple-quantum-dot array, starting with two electrons in a spin-singlet state in the first dot, they shuttle one electron over to either the second, third, or fourth dot.
Journal ArticleDOI
Revealing Nonclassicality of Inaccessible Objects.
Tanjung Krisnanda,Margherita Zuppardo,Margherita Zuppardo,Mauro Paternostro,Tomasz Paterek,Tomasz Paterek,Tomasz Paterek +6 more
TL;DR: This work introduces schemes for assessing the nonclassicality of the inaccessible objects as characterized by quantum discord, and applies one of the schemes to a membrane-in-the-middle optomechanical system to detect system-environment correlations in open system dynamics as well as nonclassicalship of the environment.
References
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Quantum computation with quantum dots
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