STIC: Photonic Quantum Computation through Cavity Assisted Interaction
Interim progress rept. 1 Aug 2005-31 Jul 2006
CALIFORNIA INST OF TECH PASADENA OFFICE OF SPONSORED RESEARCH
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One of the promising models for scalable quantum computation utilizes polarizations of single-photon pulses as qubits. The critical and difficult tasks for this approach include how to generate deterministically well-controlled single-photon pulses, how to make efficient single-photon detections, and in particular, how to realize controlled quantum gate operations between these pulses. Based on the state-of-the-art cavity technology, we propose to use a high-Q cavity with a single-trapped atom as the critical resource to fulfill all these difficult tasks. In particular We propose experiments to use a single atom in an optical cavity to generate deterministically single-photon pulses and multi-partite entanglement between the pulses. We propose an efficient scheme for quantum gate operations between these photonic qubits by coherent interactions of the single-photon pulses from the single-atom cavity. This method is scalable, robust to important practical noise, and fits well the experimental capabilities. We will achieve proof-of-principle experiments for these quantum gate operations. We propose to use the single-atom cavity as an efficient quantum non-demolition detector of single photon pulses. Its efficiency can be significantly higher than conventional detectors, and can detect the photon without destroying it. These features enable many important applications. We propose to study efficient quantum error correction for our model of quantum computation. Due to its special noise properties, it is possible with this setup to find error thresholds significantly better than those in existing analyses for large-scale fault-tolerant quantum computation.
- Electrical and Electronic Equipment
- Quantum Theory and Relativity