Measuring quantum uncertainty in squeezed light, in attoseconds

Measuring and shaping quantum uncertainty changes in squeezed light.

This is *not* one of my absurd surreal posts.

A couple of key definitions to understand before reading this article:

⚫ Femtosecond = one quadrillionth of a second;
(10−15) of a second.

⚫ Attosecond = one quintillionth of a second;
(10−18) of a second;
1/1,000th of a femtosecond;
An attosecond is to a second, as a second is to approximately 31.69 billion years.

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“Scientists make first-ever measurement of quantum uncertainty in real-time.

In a stunning leap for quantum optics, scientists have generated ultrafast light pulses whose quantum uncertainty can be directly controlled and observed in real time.

The achievement pushes the boundaries of both physics and technology, offering a new way to visualize the mysterious uncertainty principle first introduced by Werner Heisenberg nearly a century ago.

… The pulses are only a few femtoseconds – millionths of a billionth of a second –
⚫ and demonstrate the behavior of quantum uncertainty on attosecond timescales.

Their work describes how the researchers created “squeezed light” through a nonlinear process called degenerate four-wave mixing in fused silica.

In this unique form of light, variations of one property – like intensity – are reduced, or “squeezed,” and uncertainty in another, for example, phase, is increased.
[ Note: see graphic ]

… By measuring the phase and amplitude of squeezed light against a normal reference beam, the researchers confirmed that uncertainty in amplitude had indeed decreased and uncertainty in phase had increased, as quantum theory had forecasted.

… Through manipulation of an array of exact delay controls, the scientists minimally altered the timing between the three input beams by attoseconds.

They found that if all pulses perfectly coincided, uncertainty of amplitude was smallest.

As soon as one pulse lagged or led another, that uncertainty was higher.

This dynamic process revealed, for the first time ever, how quantum uncertainty develops and stabilizes over time rather than being static.

This change from amplitude to phase squeezing turned this trend around, showing that both types of uncertainty act uniformly and can be manipulated with ultrahigh precision.

The result is the first attosecond-scale measurement of quantum property variations of light.

… For decades, Heisenberg’s uncertainty principle has been treated as a static rule – a boundary no measurement could surpass.

⚫ This study shows that uncertainty itself can move, fluctuate, and be engineered, bringing quantum mechanics closer to real-world control.

“This represents a paradigm shift in quantum optics,” said Hassan. 
⚫ “We’re not just observing quantum effects – we’re shaping them.” …

yahoo.com ↗

[ Caption for image: Ultrafast squeezed light phase and intensity uncertainty measurements ]