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A photon-photon quantum gate based on Rydberg interactions in a cavity


The objective of this project is to realize a photon-photon CNOT gate. The gate will be based on three ingredients, first electromagnetically induced transparency (EIT) in an ultracold atomic gas, second Rydberg blockade, and third an optical resonator of moderate finesse. This previously unimplemented scheme combines the advantages of Rydberg blockade with the advantages offered by optical resonators. It is expected that this should make it possible to reach gate efficiencies considerably higher than all previous experimental implementations of photon-photon CNOT gates. This work builds on experience gained in past experiments in which we demonstrated a photon-photon CNOT gate based on EIT and Rydberg blockade. As our previous work did not employ an optical resonator, it required fairly high atomic density. This resulted in a fairly high dephasing rate, which severely limited the gate efficiency. Combination with an optical resonator is expected to allow it to operate the gate at much lower atomic density, which is expected to result in much higher gate efficiency and improved gate fidelity. This work is expected to open up new possibilities for high-efficiency photonic Bell-state detection, for quantum communication, quantum networking, and quantum computation.

Principal Investigator

Stephan Duerr, Max-Planck-Institut für Quantenoptik

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