Long-coherence high-fidelity electron qubits on quantum solids
Abstract
We target to build an ideal quantum information architecture based on a fundamentally new solid-state qubit platform that we recently realized - isolated single electrons trapped on the surface of an ultraclean quantum-solid neon in vacuum and manipulated by microwave photons in a superconducting quantum circuit. Quantum information can be encoded in the charge (motional) or spin states of the electrons in this system. As of today, our electron-on-solid-neon (eNe) qubits, as charge qubits, have shown 0.1ms coherence time, 99.97percent 1-qubit gate fidelity, 98.1 percent single-shot readout fidelity (without using a quantum-limited amplifier), and 2-qubit strong coupling. They have outperformed all the traditional superconductor - semiconductor charge qubits and rivaled the best superconducting transmon qubits to date. Once 2-qubit entangling gates are achieved in near term, the eNe charge qubits will have all the required components for universal quantum computing. If being generalized to spin qubits, their performance can be orders-of-magnitude better. In this program, we will largely advance eNe charge qubits and realize eNe spin qubits. We will utilize state-of-the-art quantum microwave and transport approaches from the superconductor - semiconductor qubit platforms to control, readout, couple, and transfer the qubits. We will significantly extend the coherence time, improve the gate and readout fidelities, and achieve high-fidelity 2-qubit gates for eNe charge qubits. We will realize eNe spin qubits with a synthetic spin-motion coupling from a magnetic field gradient and strongly couple two spin qubits. We will also develop the tunneling-driven double-quantum-dot charge and spin qubits, including the singlet-triplet spin qubits. We will demonstrate and envision the unique advantages of our qubit platform for scaling up by making a 4-qubit prototype processor. Our end goal is to deliver a superior qubit platform with long coherence time, fast control speed, high operation fidelity, and large interqubit connectivity, promising for large-scale quantum information processing.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Mar 07, 2024
- Source ID
- FA95502310636
Entities
People
- Dafei Jin
Organizations
- Air Force Office of Scientific Research
- United States Air Force
- University of Notre Dame