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Quantum nondemolition photon detection in circuit QED and the quantum Zeno effect

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PhysRevA.79.052115.pdf
(Any fulltext), 341KB

Supplementary Material (public)

2009_Quantum.png
(Supplementary material), 21KB

Citation

Helmer, F., Mariantoni, M., Solano, E., & Marquardt, F. (2009). Quantum nondemolition photon detection in circuit QED and the quantum Zeno effect. Physical Review A, 79(5): 052115. doi:10.1103/PhysRevA.79.052115.


Cite as: http://hdl.handle.net/21.11116/0000-0001-D7E3-C
Abstract
We analyze the detection of itinerant photons using a quantum nondemolition measurement. An important example is the dispersive detection of microwave photons in circuit quantum electrodynamics, which can be realized via the nonlinear interaction between photons inside a superconducting transmission line resonator. We show that the back action due to the continuous measurement imposes a limit on the detector efficiency in such a scheme. We illustrate this using a setup where signal photons have to enter a cavity in order to be detected dispersively. In this approach, the measurement signal is the phase shift imparted to an intense beam passing through a second cavity mode. The restrictions on the fidelity are a consequence of the quantum Zeno effect, and we discuss both analytical results and quantum trajectory simulations of the measurement process.