Errors in trapped-ion quantum gates due to spontaneous photon scattering

By R. Ozeri, W. Itano, R. B. Blakestad, J. Britton, J. Chiaverini, John D. Jost, C. Langer, Dietrich Leibfried, R. Reichle, S. Seidelin and 2 more. 2006

151 citations recorded by the source corpus.

We analyze the error in trapped-ion, hyperfine qubit, quantum gates due to spontaneous scattering of photons from the gate laser beams. We investigate single-qubit rotations that are based on stimulated Raman transitions and two-qubit entangling phase gates that are based on spin-dependent optical dipole forces. This error is compared between different ion species currently being investigated as possible quantum-information carriers. For both gate types we show that with attainable laser powers the scattering error can be reduced to below current estimates of the fault-tolerance error threshold.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/714ecb0ab906113b96edb31af901b5942c4faa75

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In Artificial Intelligence

In Atomic and Molecular Physics, and Optics

Citations in the corpus

Realization of a programmable two-qubit quantum processor (2009, background): “The primary fidelity loss mechanisms are percent-level intensity fluctuations in the Raman light fields[10] and spontaneous emission[26]; the fidelities observed here are consistent with those demonstrated previously[10] after accounting for the increased number of gates.”
Towards fault-tolerant quantum computing with trapped ions (2008, background): “Whereas spontaneous scattering from the mediating short-lived levels degrades the gate fidelity owing to the limited amount of laser power available in current experiment”
Quantum computing with trapped ions (2008, background): “For a detailed discussion of these issues, we refer here to Ozeri et al. (2007).”
Entangled states of trapped atomic ions (2008, unknown): “In general, it seems that gate fidelities are compromised by limited control of classical components (such as fluctuations in the laser-beam intensity at the positions of the ions) and by quantum limitations (such as decoherence caused by spontaneous emission”