High-fidelity quantum sensing of magnon excitations with a single electron spin in quantum dots |
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Institution: | 1.Key Laboratory of Quantum Information, University of Science and Technology of China, Chinese Academy of Sciences, Hefei 230026, China;2.Hefei National Laboratory, University of Science and Technology of China, Chinese Academy of Sciences, Hefei 230088, China |
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Abstract: | Single-electron spins in quantum dots are the leading platform for qubits, while magnons in solids are one of the emerging candidates for quantum technologies. How to manipulate a composite system composed of both systems is an outstanding challenge. Here, we use spin-charge hybridization to effectively couple the single-electron spin state in quantum dots to the cavity and further to the magnons. Through this coupling, quantum dots can entangle and detect magnon states. The detection efficiency can reach 0.94 in a realistic experimental situation. We also demonstrate the electrical tunability of the scheme for various parameters. These results pave a practical pathway for applications of composite systems based on quantum dots and magnons. |
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Keywords: | quantum sensing magnons excitations spin qubits in quantum dots |
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