Proven Quantum Leap: Using Entangled Light, DTU Researchers Reduce Learning Task Time from 20 Million Years to 15 Minutes
In a novel demonstration of quantum advantage for a learning job carried out exclusively on a photonic system, researchers at the Technical University of Denmark (DTU) and its international colleagues have made the announcement.
Through the creative use of entangled light and a special joint measurement technique, researchers at the Technical University of Denmark (DTU) and international partners were able to drastically reduce the learning task time in just 15 minutes compared to an estimated 20 million years using comparable classical methods.
It is the first demonstrated quantum advantage for a photonic system. The reduction factor that was attained is roughly 7×1011.
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An explanation of the methodology that made this quantum leap possible is provided below:
The Challenge: Exponential Scaling of Measurements
A physical system, such as a gadget, requires repeated measurements to determine its “noise fingerprint” in order to be characterised. This is the fundamental issue that the DTU researchers are attempting to solve, and it crosses both science and engineering. It is possible to handle this characterisation in classical systems, but it gets exponentially challenging in quantum devices.
Quantum noise is an inherent component of the measurements. The technique can quickly become impractical or even impossible for big quantum systems since the number of experiments needed to characterise them might scale exponentially with the system’s size.
To discover a different way to drastically cut down on the number of measurements required to understand the behaviour of a complicated, noisy quantum system, the researchers turned to entangled light.
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The Solution: Entanglement and Reference Beams
The strategic application of quantum physics, in particular entanglement, to extract information far more effectively per trial than with classical approaches resulted in the significant time reduction.
Entanglement is Key: In quantum mechanics, entanglement is the idea that two particles or beams of light are so closely related that measuring one immediately yields information about the other.
System Setup: An optical channel was used in the experiment, and several light pulses shared the same noise pattern.
Squeezing and Preparation: Two light beams were “squeezed,” or prepared, in a unique way, causing them to entangle. The squeezer, an optical parametric oscillator (OPO) that manipulates the quantum fluctuations of light by means of a nonlinear crystal inside an optical cavity, is the apparatus that causes this entanglement.
Probe and Reference: One entangled beam was utilised to probe the system that was being studied, and the other entangled beam served as a reference.
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The Mechanism: Joint Measurement
Not the need for an ideal measuring apparatus, but the measurement technique made possible by entanglement, was the secret to the shortened learning time.
Simultaneous Comparison: A joint measurement was carried out in a single shot to compare the two entangled beams (the reference and the probe).
Noise Cancellation: This combined comparison effectively cancels much of the intrinsic measurement noise(“fuzz”).
Information Extraction: When the noise is eliminated, the technique extracts much more information per trial than if the probe beam were the only thing being examined.
The total number of measurements needed to characterise the system was significantly decreased. This allowed the learning process to be finished in 15 minutes rather than 20 million years since entanglement allows researchers to extract substantially more information from a single experiment. According to Professor Ulrik Lund Andersen, the experiment demonstrated that entanglement significantly lowers the quantity of measurements required to learn such a system.
The experimental setup was robust enough to function even with common losses, used well-known optical components, and operated at telecom wavelengths, highlighting the fact that the measuring approach itself is the advantage.
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