Long-lived entanglement of a spin-qubit register in silicon photonics

• URL: http://arxiv.org/abs/2504.15467v1
• Date: Mon, 21 Apr 2025 22:29:18 GMT
• Title: Long-lived entanglement of a spin-qubit register in silicon photonics
• Authors: Hanbin Song, Xueyue Zhang, Lukasz Komza, Niccolo Fiaschi, Yihuang Xiong, Yiyang Zhi, Scott Dhuey, Adam Schwartzberg, Thomas Schenkel, Geoffroy Hautier, Zi-Huai Zhang, Alp Sipahigil,
• Abstract summary: T center in silicon is an emerging spin-photon interface that combines telecom O-band optical transitions and a long-lived electron spin.<n>A three-qubit register based on the electron spin of a T center coupled to a hydrogen and a silicon nuclear spin is demonstrated.<n>Results show that T centers can realize a long-lived multi-qubit register with an optical interface in silicon photonics.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Color centers provide an optical interface to quantum registers based on electron and nuclear spin qubits in solids. The T center in silicon is an emerging spin-photon interface that combines telecom O-band optical transitions and a long-lived electron spin in a scalable photonics platform. In this work, we demonstrate the initialization, coherent control, and state readout of a three-qubit register based on the electron spin of a T center coupled to a hydrogen and a silicon nuclear spin. The spin register exhibits long spin echo coherence times of $0.41(2)$ ms for the electron spin, $112(12)$ ms for the hydrogen nuclear spin, and $67(7)$ ms for the silicon nuclear spin. We use nuclear-nuclear two-qubit gates to generate entanglement between the two nuclear spins with a fidelity of $F=0.77(3)$ and a coherence time of $T^*_2=2.60(8)$ ms. Our results show that T centers can realize a long-lived multi-qubit register with an optical interface in silicon photonics.

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