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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Photon-number squeezing in circuit quantum electrodynamics.

M Marthaler1, Gerd Schön, Alexander Shnirman

  • 1Institut für Theoretische Festkörperphysik and DFG-Center for Functional Nanostructures (CFN), Universität Karlsruhe, 76128 Karlsruhe, Germany.

Physical Review Letters
|October 15, 2008
PubMed
Summary
This summary is machine-generated.

Superconducting single-electron transistors can generate specific quantum states in anharmonic oscillators. This research demonstrates the creation of squeezed photon distributions and near-Fock states by controlling quasiparticle tunneling.

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Area of Science:

  • Quantum optics
  • Superconducting quantum circuits
  • Mesoscopic physics

Background:

  • Superconducting single-electron transistors (SSETs) coupled to anharmonic oscillators can induce nonequilibrium photon distributions.
  • Biasing SSETs at the Josephson quasiparticle cycle enables oscillator cooling and photon number enhancement.

Purpose of the Study:

  • To investigate the generation of strongly squeezed photon-number distributions using SSETs and anharmonic oscillators.
  • To explore the potential for creating nearly pure Fock states under specific conditions.

Main Methods:

  • Theoretical analysis of an SSET coupled to a Josephson junction-L-C circuit (anharmonic oscillator).
  • Consideration of the quasiparticle tunneling rate cutoff due to the superconducting gap.
  • Analysis of the role of oscillator anharmonicity and dissipation.

Main Results:

  • The interplay between the superconducting gap cutoff and oscillator anharmonicity can lead to strongly squeezed photon-number distributions.
  • For systems with low dissipation, the generation of nearly pure Fock states is predicted.
  • Demonstration of a mechanism for controlling quantum states in superconducting circuits.

Conclusions:

  • SSETs offer a promising route for generating non-classical states of light in anharmonic oscillators.
  • The proposed method allows for precise control over photon statistics, potentially enabling applications in quantum information processing.
  • The findings highlight the importance of superconducting gap effects and anharmonicity in quantum state engineering.