Parallel Low-Loss Measurement of Multiple Atomic Qubits

• Published in: Physical review letters Vol. 119; no. 18; p. 180504
• Main Authors: Kwon, Minho, Ebert, Matthew F, Walker, Thad G, Saffman, M
• Format: Journal Article
• Language: English
• Published: United States 03-11-2017
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PhysRevLett.119.180504

We demonstrate low-loss measurement of the hyperfine ground state of rubidium atoms by state dependent fluorescence detection in a dipole trap array of five sites. The presence of atoms and their internal states are minimally altered by utilizing circularly polarized probe light and a strictly controlled quantization axis. We achieve mean state detection fidelity of 97% without correcting for imperfect state preparation or background losses, and 98.7% when corrected. After state detection and correction for background losses, the probability of atom loss due to the state measurement is <2% and the initial hyperfine state is preserved with >98% probability.