Electron charge qubits on solid neon with 0.1 millisecond coherence time

• URL: http://arxiv.org/abs/2210.12337v1
• Date: Sat, 22 Oct 2022 02:51:59 GMT
• Title: Electron charge qubits on solid neon with 0.1 millisecond coherence time
• Authors: Xianjing Zhou, Xinhao Li, Qianfan Chen, Gerwin Koolstra, Ge Yang, Brennan Dizdar, Xu Han, Xufeng Zhang, David I. Schuster, Dafei Jin
• Abstract summary: We report the experimental realization of ultralong-coherence electron charge qubits based upon a unique platform that we recently developed. Such qubits utilize the motional states of isolated single electrons trapped on an ultraclean solid neon surface in vacuum. The single-shot readout fidelity without using a quantum-limited amplifier is 97.5%.
• Score: 7.586441847213314
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Electron charge qubits are appealing candidates for solid-state quantum computing because of their compelling advantages in design, fabrication, control, and readout. However, electron charge qubits built upon traditional semiconductors and superconductors are historically known to suffer from a short coherence time that hardly exceeds 10 microseconds. The decoherence primarily arises from the inevitable charge noise in conventional host materials. Here, we report our experimental realization of ultralong-coherence electron charge qubits based upon a unique platform that we recently developed. Such qubits utilize the motional states of isolated single electrons trapped on an ultraclean solid neon surface in vacuum and strongly coupled with microwave photons in an on-chip superconducting resonator. The measured relaxation time T1 and coherence time T2 are both on the order of 0.1 millisecond. The single-shot readout fidelity without using a quantum-limited amplifier is 97.5%. The average one-qubit gate fidelity using the Clifford-based randomized benchmarking is 99.95%. Simultaneous strong coupling of two qubits with the same resonator is demonstrated, as a first step toward two-qubit entangling gates for universal quantum computing. These results manifest that the electron-on-solid-neon (eNe) charge qubits have outperformed all the existing charge qubits to date and rivaled the state-of-the-art superconducting transmon qubits, holding promise as ideal qubits for a scalable quantum computing architecture.

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