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Time and frequency -Domain Interpretation of Phase-lag Control01:21

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Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
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Linear Optical Quantum Computation with Frequency-Comb Qubits and Passive Devices.

Tomohiro Yamazaki1,2, Tomoaki Arizono1, Toshiki Kobayashi1,2

  • 1Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan.

Physical Review Letters
|June 2, 2023
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Summary
This summary is machine-generated.

We introduce a linear optical quantum computation method using time-frequency properties. This approach encodes qubits in photon frequency combs and uses basic optical components, offering robustness against errors for potential fault-tolerant quantum computing.

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Area of Science:

  • Quantum Information Science
  • Quantum Optics
  • Linear Optical Quantum Computation

Background:

  • Quantum computation harnesses quantum phenomena for advanced computation.
  • Linear optical quantum computation (LOQC) offers a promising, albeit challenging, pathway.
  • Scalability and error robustness are key hurdles in LOQC development.

Purpose of the Study:

  • To propose a novel linear optical quantum computation scheme.
  • To utilize time-frequency degrees of freedom for encoding and manipulating qubits.
  • To assess the feasibility of the scheme with current technologies.

Main Methods:

  • Encoding qubits in single-photon frequency combs.
  • Utilizing time-resolving detectors, beam splitters, and optical interleavers for qubit manipulation.
  • Analyzing the scheme's robustness against temporal and spectral errors.

Main Results:

  • Demonstrated a qubit encoding scheme using frequency combs.
  • Showcased manipulation via passive optical elements and time-resolving detectors.
  • Identified robustness against detector-induced temporal and spectral errors.

Conclusions:

  • The proposed scheme offers a passive and robust approach to quantum computation.
  • Current technologies are nearing the requirements for implementing fault-tolerant quantum computation using this method.
  • This work paves the way for practical advancements in linear optical quantum computing.