| Autor: |
Juan P, Dehollain, Juha T, Muhonen, Kuan Y, Tan, Andre, Saraiva, David N, Jamieson, Andrew S, Dzurak, Andrea, Morello |
| Rok vydání: |
2014 |
| Předmět: |
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| Zdroj: |
Physical review letters. 112(23) |
| ISSN: |
1079-7114 |
| Popis: |
We present the experimental observation of a large exchange coupling J ≈ 300 μeV between two (31)P electron spin qubits in silicon. The singlet and triplet states of the coupled spins are monitored in real time by a single-electron transistor, which detects ionization from tunnel-rate-dependent processes in the coupled spin system, yielding single-shot readout fidelities above 95%. The triplet to singlet relaxation time T(1) ≈ 4 ms at zero magnetic field agrees with the theoretical prediction for J-coupled 31P dimers in silicon. The time evolution of the two-electron state populations gives further insight into the valley-orbit eigenstates of the donor dimer, valley selection rules and relaxation rates, and the role of hyperfine interactions. These results pave the way to the realization of two-qubit quantum logic gates with spins in silicon and highlight the necessity to adopt gating schemes compatible with weak J-coupling strengths. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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