Quantum information processing with Schrödinger cats

Kae Nemoto; Alexei Gilchrist; William J. Munro; Tim C. Ralph; Samuel L. Braunstein; Gerard J. Milburn

doi:10.1117/12.497230

16 May 2003 Quantum information processing with Schrodinger cats

Kae Nemoto, Alexei Gilchrist, William J. Munro, Tim C. Ralph, Samuel L. Braunstein, Gerard J. Milburn

Proceedings Volume 5111, Fluctuations and Noise in Photonics and Quantum Optics; (2003) https://doi.org/10.1117/12.497230
Event: SPIE's First International Symposium on Fluctuations and Noise, 2003, Santa Fe, New Mexico, United States

Abstract

Quantum optics has proved a fertile field for experimental tests of quantum information science, from experimental verification of the violation of the Bell inequalities to quantum teleportation. However it was long believed that quantum optics would not provide a practical path to efficient and scaleable quantum computation, and most current efforts to achieve a scaleable quantum computer have focussed on solid state implementations. This orthodoxy was challenged recently when Knill et al. showed that given single photon sources and single photon detectors, linear optics alone would suffice to implement efficient quantum computation. While this result is surprising, the complexity of the optical networks required is daunting. In this talk we propose an efficient scheme which is elegant in its simplicity. We indicate how fundamental single and two qubit gates can be achieved. By encoding the quantum information in multi-photon coherent states, rather than single photon states, simple optical manipulations acquire unexpected power. As an application of this new information processing ability we investigate a class of high precision measurements. We show how superpositions of coherent states allow displacement measurements at the Heisenberg limit. Entangling many superpositions of coherent states offers a significant advantage over a single mode superposition states with the same mean photon number.

Citation Download Citation

Kae Nemoto, Alexei Gilchrist, William J. Munro, Tim C. Ralph, Samuel L. Braunstein, and Gerard J. Milburn "Quantum information processing with Schrodinger cats", Proc. SPIE 5111, Fluctuations and Noise in Photonics and Quantum Optics, (16 May 2003); https://doi.org/10.1117/12.497230

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