Preserving a qubit during adjacent measurements at a few micrometers distance

• URL: http://arxiv.org/abs/2306.03075v1
• Date: Mon, 5 Jun 2023 17:50:36 GMT
• Title: Preserving a qubit during adjacent measurements at a few micrometers distance
• Authors: Sainath Motlakunta, Nikhil Kotibhaskar, Chung-You Shih, Anthony Vogliano, Darian Mclaren, Lewis Hahn, Jingwen Zhu, Roland Habl\"utzel, and Rajibul Islam
• Abstract summary: Current attempts to preserve qubits against resonant laser-driven adjacent measurements waste valuable experimental resources. We demonstrate high-fidelity preservation of an asset' ion qubit while a neighboring process' qubit is reset or measured at a few microns distance.
• Score: 0.7785955518529766
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Protecting a quantum object against irreversible accidental measurements from its surroundings is necessary for controlled quantum operations. This becomes especially challenging or unfeasible if one must simultaneously measure or reset a nearby object's quantum state, such as in quantum error correction. In atomic systems - among the most established quantum information processing platforms - current attempts to preserve qubits against resonant laser-driven adjacent measurements waste valuable experimental resources such as coherence time or extra qubits and introduce additional errors. Here, we demonstrate high-fidelity preservation of an `asset' ion qubit while a neighboring `process' qubit is reset or measured at a few microns distance. We achieve $< 1\times 10^{-3}$ probability of accidental measurement of the asset qubit while the process qubit is reset, and $< 4\times 10^{-3}$ probability while applying a detection beam on the same neighbor for experimentally demonstrated fast detection times, at a distance of $6\ \rm{\mu m}$ or four times the addressing Gaussian beam waist. These low probabilities correspond to the preservation of the quantum state of the asset qubit with fidelities above $99.9\%$ (state reset) and $99.6\%$ (state measurement). Our results are enabled by precise wavefront control of the addressing optical beams while utilizing a single ion as a quantum sensor of optical aberrations. Our work demonstrates the feasibility of in-situ state reset and measurement operations, building towards enhancements in the speed and capabilities of quantum processors, such as in simulating measurement-driven quantum phases and realizing quantum error correction.

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