Photon-assisted tunneling with non-classical light
arXiv:1408.1128 · doi:10.1038/ncomms6562
Abstract
Among the most exciting recent advances in the field of superconducting quantum circuits is the ability to coherently couple microwave photons in low-loss cavities to quantum electronic conductors (e.g.~semiconductor quantum dots or carbon nanotubes). These hybrid quantum systems hold great promise for quantum information processing applications; even more strikingly, they enable exploration of completely new physical regimes. Here we study theoretically the new physics emerging when a quantum electronic conductor is exposed to non-classical microwaves (e.g.~squeezed states, Fock states). We study this interplay in the experimentally-relevant situation where a superconducting microwave cavity is coupled to a conductor in the tunneling regime. We find the quantum conductor acts as a non-trivial probe of the microwave state; in particular, the emission and absorption of photons by the conductor is characterized by a non-positive definite quasi-probability distribution. This negativity has a direct influence on the conductance of the conductor.
8 pages, 5 figures; Supplementary Information: 12 pages 8 figures
References in corpus (10)
- Circuit Quantum Electrodynamics with a Spin Qubit
- Implementation of low-loss superinductances for quantum circuits
- Experimental Test of the High-Frequency Quantum Shot Noise Theory in a Quantum Point Contact
- Dynamics of Quantum Noise in a Tunnel Junction under ac Excitation
- Mesoscopic admittance of a double quantum dot
- Lasing and transport in a quantum dot-resonator circuit
- Dynamical Coulomb Blockade of Shot Noise
- Introduction of a DC Bias into a High-Q Superconducting Microwave Cavity
- Experimental Test of the Dynamical Coulomb Blockade Theory for Short Coherent Conductors
- Full counting statistics and conditional evolution in a nanoelectromechanical system