Regensburg 2013 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 37: Quantum Coherence, Quantum Information Systems 1

TT 37.4: Talk

Wednesday, March 13, 2013, 10:15–10:30, H19

A Quantum Single Photon Transistor in Circuit Quantum Electrodynamics — Lukas Neumeier, •Martin Leib, and Michael Hartmann — TU München, 85748 Garching, Germany

We propose a superconducting transmission line setup that acts as a single photon transistor for itinerant microwave signals. Photons are ideal carriers of quantum information as they rarely interact while traveling long distances which opens great possibilities for scaling up from one elementary two photon gate to many. However the advantage of great robustness with respect to environmental perturbations poses a great challenge to generate photon-photon interactions where they are needed. The enhanced light-matter interactions due to the quasi-onedimensional geometry of superconducting transmission lines and the macroscopic dipole moments of superconducting artificial atoms may provide a route out of this dilemma. In our setup a "control"-photon inverts a superconducting qubit which in turn shifts the energy of another superconducting qubit that is coupled to the transmission line of a "target"-photon. The "target"-photon is reflected if the energies of "target"-photon and superconducting qubit are degenerate and transmitted if they are sufficiently detuned. We show that this setup can be realized with flux qubits as well as with transmon qubits.