Frequency stabilization of a titanium-sapphire laser and improvement of qubits based on Ca+-ions

Add to your list(s) Download to your calendar using vCal

• Tobias Macha (University of Mainz)
• Thursday 11 April 2013, 10:00-11:30
• Rutherford building, Seminar Room B.

If you have a question about this talk, please contact pjh65.

We trap ions in a linear micro segmented Paul-trap for the purpose of quantum information processing. Qubits are encoded in magnetic sublevels of the ground state of Ca+ and manipulated with laser light near 729 nm from a TiSa laser. A stable light source is essential to achieve long coherence times, which are necessary for storing quantum information in a qubit. The frequency stabilization is performed by locking the laser to an ultra-stable Fabry-Pérot resonator using a Pound-Drever-Hall error signal and fast electronics. The quality of the lock can be determined from a beat note with another laser at 729 nm. Additionally, a spin-echo sequence on the calcium ion allows to achieve a value of the laser linewidth and the resulting qubit coherence time. We have separated the contribution of the magnetic field fluctuations on the coherence time by interrogating transitions with different susceptibility to the ambient magnetic field. A possibility of extending the coherence time is demonstrated using a spin-lock technique

This talk is part of the AMOP list series.

This talk is included in these lists:

• AMOP list
• All Cavendish Laboratory Seminars
• All Talks (aka the CURE list)
• Centre for Health Leadership and Enterprise
• Featured lists
• ME Seminar
• Neurons, Fake News, DNA and your iPhone: The Mathematics of Information
• Rutherford building, Seminar Room B
• School of Physical Sciences
• Thin Film Magnetic Talks

Note that ex-directory lists are not shown.