Berlin 2014 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 7: Ultracold plasmas and Rydberg systems I (with A)

Q 7.5: Talk

Monday, March 17, 2014, 11:30–11:45, DO24 1.101

Optical quantum information processing using Rydberg atoms — •David Paredes Barato, Hannes Busche, Simon Ball, David Szwer, Matthew Jones, and Charles Adams — Joint Quantum Centre (JQC) Durham-Newcastle, Department of Physics, Durham University, South Road, Durham DH1 3LE, UK

Implementing nontrivial, controllable gates between single photons is a challenge due to the weak nonlinearities present in most materials. When there are strong nonlinearities, such as cross-Kerr nonlinearities, they distort the wavepackets of the photons [1].

Advances in quantum optics with Rydberg atoms have shown that their strong dipole-dipole interactions can be mapped into nonlinearities at the single-photon level [2-4]. The non-local character of these optical nonlinearities at short scales could allow one to circumvent the difficulties in applying other (local) methods to QIP.

Here we present a hybrid optical quantum gate scheme [5] using electromagnetically induced transparency (EIT), dipole blockade and microwave control [4]. This scheme makes use of the spatial properties of the dipole blockade phenomenon to realize a photonic, controlled-z phase gate with fidelities exceding 90%. Current work on the experimental implementation and future developments will be presented.

[1] J.H. Shapiro, Phys Rev. A 73, 062305 (2006).

[2] Y.O. Dudin and A. Kuzmich, Science 18, 887 (2012).

[3] T. Peyronel et al., Nature 488, 57 (2012).

[4] D. Maxwell et al., Phys. Rev. Lett. 110, 103001 (2013).

[5] D. Paredes-Barato and C. S. Adams, Phys. Rev. Lett. to appear.