Coherent spin-exchange via a quantum mediator
Two electron spins occupying the outer dots in a linear array of three quantum dots experience a coherent superexchange interaction through the empty middle dot that acts as a quantum mediator. Coherent interactions at a distance provide a powerful tool for quantum simulation and computation. The mo...
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| Vydané v: | Nature nanotechnology Ročník 12; číslo 1; s. 26 - 30 |
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| Hlavní autori: | , , , , |
| Médium: | Journal Article |
| Jazyk: | English |
| Vydavateľské údaje: |
London
Nature Publishing Group UK
01.01.2017
Nature Publishing Group |
| Predmet: | |
| ISSN: | 1748-3387, 1748-3395, 1748-3395 |
| On-line prístup: | Získať plný text |
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| Shrnutí: | Two electron spins occupying the outer dots in a linear array of three quantum dots experience a coherent superexchange interaction through the empty middle dot that acts as a quantum mediator.
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
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and trapped ions
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. For quantum dot arrays, which combine a high degree of tunability
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with extremely long coherence times
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, the experimental demonstration of the time evolution of coherent spin–spin coupling via an intermediary system remains an important outstanding goal
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. 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
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, 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.
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), high-temperature superconductors
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and DNA
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. The same superexchange concept can also be applied in cold atom experiments
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| Bibliografia: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23 |
| ISSN: | 1748-3387 1748-3395 1748-3395 |
| DOI: | 10.1038/nnano.2016.188 |