Microtrap Fabrication Technology for
Trapped Ion Quantum Information Science

Single ion addressing and detection

• Oxford have developed time-resolved qubit detection to give single shot read-out with 99.991% fidelity in ~ 150 µs

High-fidelity readout of trapped-ion qubits
A. H. Myerson, D. J. Szwer, S. C. Webster, D. T. Allcock, M. J. Curtis, G. Imreh, J. A. Sherman, D. N. Stacey, A. M. Steane and D. M. Lucas, Phys. Rev. Lett. 100, 200502 (2008).

• Siegen have individually addressed ions in a string by means of rf optical double resonance, with a B-field gradient along trap axis

Rf-optical double resonance of linear ion string in B-field gradient

Individual Addressing of Trapped Ions and Coupling of Motional and Spin States Using rf Radiation,
Hendricks R.J, So Rensen J.L, Champenois C, Knoop M. and Drewsen M, Phys Rev. A 77(2), 021401 (2008)

Cooling, heating rates, decoherence measurement

• Sideband cooling on S-D optical qubit in Ulm ceramic layer trap
• First results show mean photon number of ~ 0.5

Sideband cooling and coherent dynamics in a microchip multi-segmented ion trap
S. Schulz, U. Poschinger, F. Ziesel and F. Schmidt-Kaler, New J. Phys. 10, 45007(2008).

See also:
Zero-point cooling and heating-rate measurements of a single ⁸⁸Sr⁺ ion
V Letchumanan, G Wilpers, M Brownnutt, P Gill and A G Sinclair (2007) Phys. Rev. A 75 063425

• Optical Ramsey spectroscopy (10 µs pulses with 100 µs free precession) on S-D qubit in Ulm ceramic layer trap

See also:
Optical Ramsey spectroscopy of a single ⁸⁸Sr⁺ ion
V Letchumanan, P Gill, E Riis and A G Sinclair Phys. Rev. A 70 033419 (2004)