Quantum non-demolition measurement of an electron spin qubit through its low-energy many-body spin environment

• URL: http://arxiv.org/abs/2307.00308v1
• Date: Sat, 1 Jul 2023 11:30:37 GMT
• Title: Quantum non-demolition measurement of an electron spin qubit through its low-energy many-body spin environment
• Authors: Harry E. Dyte, George Gillard, Santanu Manna, Saimon F. Covre da Silva, Armando Rastelli, Evgeny A. Chekhovich
• Abstract summary: Link from quantum to classical can be made without any "wavefunction collapse" We show that the link can be made without any "wavefunction collapse"
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The measurement problem dates back to the dawn of quantum mechanics. Here, we measure a quantum dot electron spin qubit through off-resonant coupling with thousands of redundant nuclear spin ancillae. We show that the link from quantum to classical can be made without any "wavefunction collapse", in agreement with the Quantum Darwinism concept. Large ancilla redundancy allows for single-shot readout with high fidelity $\approx99.85\%$. Repeated measurements enable heralded initialization of the qubit and probing of the equilibrium electron spin dynamics. Quantum jumps are observed and attributed to burst-like fluctuations in a thermally populated phonon bath.

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