Bayesian feedback control of a two-atom spin-state in an atom-cavity system.

@article{Brakhane2012BayesianFC,
  title={Bayesian feedback control of a two-atom spin-state in an atom-cavity system.},
  author={Stefan Brakhane and Wolfgang Alt and Tobias Kampschulte and Miguel Martinez-Dorantes and Ren{\'e} Reimann and Seokchan Yoon and Artur Widera and Dieter Meschede},
  journal={Physical review letters},
  year={2012},
  volume={109 17},
  pages={
          173601
        }
}
We experimentally demonstrate real-time feedback control of the joint spin-state of two neutral cesium atoms inside a high finesse optical cavity. The quantum states are discriminated by their different cavity transmission levels. A Bayesian update formalism is used to estimate state occupation probabilities as well as transition rates. We stabilize the balanced two-atom mixed state, which is deterministically inaccessible, via feedback control and find very good agreement with Monte Carlo… 

Figures from this paper

Single-Photon-Resolved Cross-Kerr Interaction for Autonomous Stabilization of Photon-Number States.

A quantum-reservoir engineering protocol that stabilizes Fock states in a microwave cavity and is discussed in terms of a net polarization and is analyzed by a measurement of its steady state Wigner function.

Quantum feedback experiments stabilizing Fock states of light in a cavity

System: Microwave cavity field Target: Fock state Sensor (quantum): Off-resonant atoms performing a QND measurement of the field. Controller (classical): State estimation at each atomic detection and

Photon-Mediated Quantum Information Processing with Neutral Atoms in an Optical Cavity

In this dissertation, the common coupling of two atomic qubits to the mode of an optical cavity is studied. Reflection of light pulses from the coupled atom-atom-cavity system and their subsequent

Entanglement generation under feedback control in dispersive regime

The entanglement generation in a system of two atoms dispersively coupled to a damped cavity mode and driven by a classical field is investigated by using the quantum-jump-based feedback control. We

Parameter estimation from measurements along quantum trajectories

A new formulation of particle quantum filters is proposed to prove stability, and to provide an efficient algorithm preserving, for any discretization step-size, positivity of the quantum states and parameter classical probabilities.

Coherent versus measurement-based feedback for controlling a single qubit

We compare the performance of continuous coherent feedback, implemented using an ideal single-qubit controller, to that of continuous measurement-based feedback (MBF) for the task of controlling the

Optimal measurement-based feedback control for a single qubit: a candidate protocol

A series of arguments are presented that suggest a particular form for the optimal protocol for a broad class of noise sources in the regime of good control, and conjecture that this protocol is optimal to leading order in the small parameters that define this regime.

Creation of entangled states of a set of atoms in an optical cavity

In this thesis, we demonstrate the creation and characterization of multiparticle entangled states of neutral atoms with the help of a high finesse cavity. Our experimental setup consists of a

Unambiguous atomic Bell measurement assisted by multiphoton states

We propose and theoretically investigate an unambiguous Bell measurement of atomic qubits assisted by multiphoton states. The atoms interact resonantly with the electromagnetic field inside two

Feedback-based active reset of a spin qubit in silicon

A cumulative readout technique is incorporated to the active reset protocol, enhancing initialization fidelity above a limitation imposed by accuracy of the single QND measurement fidelity.

References

SHOWING 1-10 OF 10 REFERENCES

Quantum computation and quantum information

  • T. Paul
  • Physics
    Mathematical Structures in Computer Science
  • 2007
This special issue of Mathematical Structures in Computer Science contains several contributions related to the modern field of Quantum Information and Quantum Computing. The first two papers deal

Quantum computation and quantum information

This chapter discusses quantum information theory, public-key cryptography and the RSA cryptosystem, and the proof of Lieb's theorem.

Applied Physics B: Lasers and Optics

  • Physics
  • 2003
To clarify the advantages of Cr:Nd:YAG ceramics rods in solar-pumped lasers, a fused silica light guide with rectangular cross-section is coupled to a compound V-shaped cavity within which a 7 mm

Data analysis : a Bayesian tutorial

This tutorial jumps right in to the power ofparameter estimation without dragging you through the basic concepts of parameter estimation.

Physical Review Letters 63

  • 1989

Nature Phys

  • 8, 292
  • 2012

* Electronic address: brakhane@iap.uni-bonn

    Physics Today 57

    • 38
    • 2004

    Nature (London) 475

    • 210 (2011). PRL 109, 173601
    • 2012

    New J

    • Phys. 10, 073023
    • 2008