Abstract
Fast, high-fidelity measurement is a key ingredient for quantum error correction. Conventional approaches to the measurement of superconducting qubits, involving linear amplification of a microwave probe tone followed by heterodyne detection at room temperature, do not scale well to large system sizes. We introduce an approach to measurement based on a microwave photon counter demonstrating raw single-shot measurement fidelity of 92%. Moreover, the intrinsic damping of the photon counter is used to extract the energy released by the measurement process, allowing repeated high-fidelity quantum nondemolition measurements. Our scheme provides access to the classical outcome of projective quantum measurement at the millikelvin stage and could form the basis for a scalable quantum-to-classical interface.
Original language | English (US) |
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Pages (from-to) | 1239-1242 |
Number of pages | 4 |
Journal | Science |
Volume | 361 |
Issue number | 6408 |
DOIs | |
State | Published - Sep 21 2018 |
ASJC Scopus subject areas
- General