Massachusetts Institute of Technology (20240235148). Enhancing The Stability Of Quantum Noise Limited Feedback Oscillators simplified abstract

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Enhancing The Stability Of Quantum Noise Limited Feedback Oscillators

Organization Name

Massachusetts Institute of Technology

Inventor(s)

Hudson Alexander Loughlin of Boston MA (US)

Vivishek Sudhir of Cambridge MA (US)

Enhancing The Stability Of Quantum Noise Limited Feedback Oscillators - A simplified explanation of the abstract

This abstract first appeared for US patent application 20240235148 titled 'Enhancing The Stability Of Quantum Noise Limited Feedback Oscillators

The abstract discusses the application of feedback oscillators in providing stable references for standardization and synchronization, particularly focusing on the limitations imposed by quantum fluctuations.

  • Feedback oscillators, like lasers, can be affected by quantum fluctuations, leading to frequency instability.
  • The Schawlow-Townes formula quantifies this frequency instability, setting a limit to laser linewidth.
  • The formula applies to feedback oscillators beyond lasers due to quantum noise introduced by the amplifier and out-coupler in the feedback loop.
  • Techniques like squeezing and entanglement can help achieve sub-Schawlow-Townes linewidth in feedback oscillators.
  • The study clarifies quantum limits to the stability of feedback oscillators, deriving a standard quantum limit (SQL) and proposing strategies for sub-SQL feedback oscillators.

Potential Applications: - Precision measurement devices - Communication systems - Quantum computing

Problems Solved: - Addressing frequency instability in feedback oscillators - Improving the performance of lasers and other feedback systems

Benefits: - Enhanced stability and precision in various applications - Potential for advancements in quantum technologies

Commercial Applications: Title: Quantum-Stable Feedback Oscillators for High-Precision Applications This technology could be utilized in industries such as telecommunications, metrology, and quantum information processing, where stable and precise oscillators are crucial for operations.

Questions about Quantum-Stable Feedback Oscillators: 1. How do quantum fluctuations impact the performance of feedback oscillators? Feedback oscillators, including lasers, can experience frequency instability due to quantum fluctuations, limiting their precision and stability.

2. What are some techniques to overcome quantum noise in feedback oscillators? Techniques like squeezing and entanglement can help reduce quantum noise in feedback oscillators, enabling sub-Schawlow-Townes linewidths.


Original Abstract Submitted

a feedback oscillator, with an amplifier whose output is partially fed back to its input, provides a stable reference for standardization and synchronization. the laser is a feedback oscillator whose performance can be limited by quantum fluctuations. the resulting frequency instability, quantified by the schawlow-townes formula, sets a limit to laser linewidth. here, we show that the schawlow-townes formula applies to feedback oscillators beyond lasers. this is because it arises from quantum noise added by the amplifier and an out-coupler in the feedback loop. tracing the origin of quantum noise in an oscillator informs techniques to systematically evade it: squeezing and entanglement can enable sub-schawlow-townes linewidth feedback oscillators. we clarify the quantum limits to the stability of feedback oscillators, derive a standard quantum limit (sql) for feedback oscillators, and disclose quantum strategies for realizing sub-sql feedback oscillators.

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