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

Journal Article · Fri May 15 04:00:00 EDT 2009 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.79.052115· OSTI ID:21300802

Helmer, Ferdinand; Marquardt, Florian ^[1]; Mariantoni, Matteo ^[2]; Solano, Enrique ^[1]

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1. Department of Physics, Center for NanoScience, and Arnold Sommerfeld Center, Ludwig-Maximilians-Universitaet, Theresienstrasse 37, D-80333 Munich (Germany)
2. Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, Walther-Meissner-Str. 8, D-85748 Garching (Germany)

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.

• OSTI ID: 21300802
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 5 Vol. 79; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BEAMS
DETECTION
EFFICIENCY
MICROWAVE RADIATION
NONLINEAR PROBLEMS
PHOTONS
POWER TRANSMISSION LINES
QUANTUM COMPUTERS
QUANTUM ELECTRODYNAMICS
RESONATORS
SIMULATION