Single electrons on solid neon: a long-coherence high-fidelity solid-state qubit platform
Progress towards the realization of quantum computers requires persistent advances in their constituent building blocks – qubits. Novel qubit platforms that simultaneously embody long coherence, fast operation, high fidelity, and large connectivity offer compelling advantages in the construction of quantum computers. In this talk, I will present our experimental realization of a new qubit platform based upon isolated single electrons trapped on an ultraclean solid neon surface in vacuum. Quantum information is encoded in the motional (charge) states of an electron that is strongly coupled with microwave photons in an on-chip superconducting resonator. The measured relaxation time and coherence time are both on the order of 0.1 milliseconds. The single-shot readout fidelity without using a quantum-limited amplifier is 98.1%. The average single-qubit gate fidelity using Clifford-based randomized benchmarking is 99.97%. 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 outperform all existing charge qubits to date and rival state-of-the-art superconducting transmon qubits, offering an appealing platform for quantum computing.
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