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Communication dans un congrès

Three-wave mixing in the GHz range with Josephson junctions and resonators

Abstract : Three-wave mixing devices, i.e. non-linear circuits converting power among three microwave signals, are key elements of analog information processing in the microwave domain. However, they are based on dissipative components such as semiconductor diodes, or SIS tunnel junctions biased near the superconducting gap. The loss of signal limits their operation and also introduces noise above the minimum required by quantum mechanics. By using Josephson junctions and superconducting resonators, we've been able to build such a quantum device. In its amplification mode, this device can be used as a preamplifier in many experiments where a few photon wide microwave signals must be measured by commercial instruments, which are sensitive to powers several orders of magnitude larger. The price to pay for this amplification is the necessary degradation of information. Indeed, an extension of the no-cloning theorem imposes that a linear phase preserving amplifier adds at least half a quantum of noise to the signal. By amplifying the finite frequency noise emitted by an NIN tunnel junction, we demonstrated that the total measurement chain adds less than 2.3 quanta to this limit thanks to our device. The operating principle of this device is based on Josephson parametric amplification. I will explain this mechanism and show preliminary results which illustrate that it can generate quantum correlated pairs of spatially separated photons with different wavelengths known as two-mode squeezed states. This experiment exploits the tunability of our device and the ease-of-use inherent to micro-wave circuits to perform a quantum optics experiment demonstrating this entanglement.
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Contributeur : Benjamin Huard Connectez-vous pour contacter le contributeur
Soumis le : mardi 3 avril 2012 - 15:07:15
Dernière modification le : jeudi 17 mars 2022 - 10:08:19


  • HAL Id : hal-00684927, version 1


Nicolas Roch, Emmanuel Flurin, François Mallet, Michel H. Devoret, Benjamin Huard. Three-wave mixing in the GHz range with Josephson junctions and resonators. International SOLID Workshop, Feb 2012, Grenoble, France. ⟨hal-00684927⟩



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