Journal
PHYSICAL REVIEW LETTERS
Volume 123, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.123.110503
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Funding
- Centre for Doctoral Training on Controlled Quantum Dynamics at Imperial College London
- U.S. Army Research Office [W911NF-14-1-0217]
- U. K. EPSRC Networked Quantum Information Technology Hub
- EPSRC [1947811, 1793148, EP/M013243/1] Funding Source: UKRI
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Robust qubit memory is essential for quantum computing, both for near-term devices operating without error correction, and for the long-term goal of a fault-tolerant processor. We directly measure the memory error epsilon(m) for a Ca-43(+) trapped-ion qubit in the small-error regime and find epsilon(m) < 10(-4) for storage times t less than or similar to 50 ms. This exceeds gate or measurement times by three orders of magnitude. Using randomized benchmarking, at t = 1 ms we measure epsilon(m) = 1.2(7) x 10(-6), around ten times smaller than that extrapolated from the T-2* time, and limited by instability of the atomic clock reference used to benchmark the qubit.
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