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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Universal photonic quantum computation via time-delayed feedback.

Hannes Pichler1,2, Soonwon Choi2, Peter Zoller3,4

  • 1Institute for Theoretical Atomic, Molecular and Optical Physics, Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138; hannes.pichler@cfa.harvard.edu.

Proceedings of the National Academy of Sciences of the United States of America
|October 27, 2017
PubMed
Summary
This summary is machine-generated.

We present a method to create 2D photonic cluster states using a single quantum emitter and time-delayed quantum feedback. This approach utilizes guided photons as qubits and a mirror for feedback, enabling the generation of complex quantum states.

Keywords:
delayed feedbackphotonic quantum computationquantum optics

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Area of Science:

  • Quantum optics
  • Quantum information science
  • Condensed matter physics

Background:

  • Photonic cluster states are crucial resources for quantum computing and quantum information processing.
  • Generating large-scale, entangled photonic states deterministically remains a significant challenge.
  • Existing methods often require complex setups or probabilistic operations.

Purpose of the Study:

  • To propose and analyze a deterministic protocol for generating two-dimensional photonic cluster states.
  • To explore the use of a single quantum emitter and time-delayed quantum feedback for state generation.
  • To identify and characterize the class of many-body quantum states producible via this method.

Main Methods:

  • A theoretical protocol involving a single quantum emitter coupled to a one-dimensional waveguide with a distant mirror.
  • Utilizing guided photons as qubits.
  • Implementing time-delayed quantum feedback through the mirror interaction.
  • Characterizing generated states using two-dimensional tensor network representations.

Main Results:

  • A deterministic protocol for generating two-dimensional photonic cluster states is proposed and analyzed.
  • The physical implementation involves a single atom or atom-like system interacting with a waveguide and mirror.
  • The generated states are identified as a specific class of many-body quantum states.
  • These states are successfully characterized in terms of two-dimensional tensor network states.

Conclusions:

  • The proposed protocol offers a deterministic route to generate valuable two-dimensional photonic cluster states.
  • The single-emitter, feedback-based approach provides a scalable and potentially practical method for quantum state engineering.
  • The characterization via tensor networks offers insights into the structure and properties of the generated quantum states.