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Poster Session

Poster Session I (4pm-6pm CDT)

4:00 pm – 6:00 pm, Tuesday June 4 Session D00
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Generating a 3D Cluster State via Cold-atom Collisions in an Optical Lattice and Noise Suppression for Field-Sensitive States

Poster 73
Presenter: Peng Du (Pennsylvania State University)
Authors: Maarten de Haan (Pennsylvania State University), Mritunjay Joshi (Pennsylvania State University), Lyuhang Wu (Pennsylvania State University), David S. Weiss (Pennsylvania State University)

Cluster states, known for their robustness and maximal entanglement, are a potentially important resource in quantum information processing and quantum computing[1][2]. We are working to create a 3D cluster state of atoms in a 3D optical lattice by employing collisional entangling gates [3]. We first prepare a nearly full 3D array of cesium atoms in their vibrational ground states. Subsequent controlled cold collisions then entangle each atom with all of its nearest neighbors. The collisional generation of a 3D cluster state thus entails just three gates, each executed on all the atoms in parallel; the procedure is equivalent to the execution of 3(N3-N2) two-qubit entangling gates, where N3 is the number of atoms in a cubic array. The state-dependent motion that underlies these cold collisions necessitates the transfer of atom qubits into a field-sensitive basis. To preserve qubit coherence, we have developed feedback techniques to stabilize both the optical potential and the magnetic field. We will ultimately characterize the fidelity of our 3D cluster states by measuring their stabilizers, which will use our high-fidelity single atom addressing and state detection techniques.

[1] Raussendorf, R. & Briegel, H. J. Phys. Rev. Lett. 86, 5188–5191 (2001).

[2] Nielsen, Michael A. “Cluster-State Quantum Computation.” Reports on Mathematical Physics 57, no. 1 (2006).

[3] Jaksch, D., Briegel, H.-J., Cirac, J. I., Gardiner, C. W. & Zoller, P. Phys. Rev. Lett. 82, 1975-1978 (1999).

Funding acknowledgement

We acknowledge funding support from the National Science Foundation (NSF) and the Air Force Office of Scientific Research (AFOSR).

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