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Home Astronomy

Quantum information beamed alongside ‘classical information’ in the identical fiber-optic connection for the first time

August 25, 2024
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Quantum information beamed alongside ‘classical information’ in the identical fiber-optic connection for the first time
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Scientists have efficiently transmitted quantum information and standard information by a single optical fiber for the primary time.

The analysis demonstrates that quantum information within the type of entangled photons and standard web information despatched as laser pulses can coexist in the identical fiber-optic cable.

Most analysis into building a quantum internet has targeted on the necessity for separate infrastructure or devoted channels for quantum information to keep away from interference from “classical” information. However this new “hybrid” community may pave the way in which for extra environment friendly implementation of quantum communications by enabling quantum and standard information to share the identical infrastructure. The researchers revealed their findings in a research revealed July 26 within the journal Science Advances.

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Fiber-optic cables are composed of skinny strands of glass or plastic fibers that carry information as infrared mild pulses. These fibers transmit information by completely different colour channels, with every comparable to a selected wavelength of sunshine.

Associated: Fiber-optic data transfer speeds hit a rapid 301 Tbps — 1.2 million times faster than your home broadband connection

Researchers have previously shown that quantum information may be transmitted by a regular fiber-optic cable, however this new experiment marks the primary time that each quantum and standard information have been transmitted collectively in the identical colour channel.

Creating hybrid networks is difficult as a result of quantum information is commonly transmitted by fiber-optic cables utilizing entangled photons.

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Entanglement happens when two qubits — essentially the most fundamental items of quantum info — are linked in such a approach that info is shared between them no matter their relationship over time or house. However entanglement is a particularly delicate state that may be simply disrupted by environmental disturbances like noise or interference from different alerts. This consists of any information sharing the identical wavelength on a fiber-optic channel. This is called “decoherence,” and breaking this connection causes the qubits to lose their quantum state, leading to information loss.

“To make the quantum web a actuality, we have to transmit entangled photons by way of fiber optic networks,” research co-author Michael Kues, head of the Institute of Photonics at Leibniz College Hannover, stated in a statement. “We additionally wish to proceed utilizing optical fibres for typical information transmission.”

To get round these challenges, the scientists used a way known as electro-optic section modulation to exactly regulate the frequency of the laser pulses in order that they matched the colour of the entangled photons. This enabled each sorts of information to be transmitted in the identical colour channel with out disrupting the quantum info held by the entangled photons.

The flexibility to transmit quantum and standard information in the identical channel frees up different colour channels within the fiber-optic cable for extra information, the scientists stated. This will likely be key to creating the various functions of quantum computing, similar to ultra-secure communications and quantum cryptography, extra sensible and scalable.

“Our analysis is a vital step to mix the traditional web with the quantum web,” stated Kues. “Our experiment exhibits how the sensible implementation of hybrid networks can succeed.”



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