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ISRO Makes Breakthrough Demonstration of Free-space Quantum Key Distribution (QKD) Over 300 Meters

By Doug Messier
Parabolic Arc
March 24, 2021
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BENGALURU, India (ISRO PR) — For the first time in the country, Indian Space Research Organisation (ISRO) has successfully demonstrated free-space Quantum Communication over a distance of 300 m.

A number of key technologies were developed indigenously to accomplish this major feat, which included the use of indigenously developed NAVIC receiver for time synchronization between the transmitter and receiver modules, and gimbal mechanism systems instead of bulky large-aperture telescopes for optical alignment.

The demonstration has included live videoconferencing using quantum-key-encrypted signals. This is a major milestone achievement for unconditionally secured satellite data communication using quantum technologies.

The Quantum Key Distribution (QKD) technology underpins Quantum Communication technology that ensures unconditional data security by virtue of the principles of quantum mechanics, which is not possible with the conventional encryption systems.

The conventional cryptosystems used for data-encryption rely on the complexity of mathematical algorithms, whereas the security offered by quantum communication is based on the laws of Physics. Therefore, quantum cryptography is considered as ‘future-proof’, since no future advancements in the computational power can break quantum-cryptosystem.

The free-space QKD was demonstrated at Space Applications Centre (SAC), Ahmedabad, between two line-of-sight buildings within the campus. The experiment was performed at night, in order to ensure that there is no interference of the direct sunlight.

The experiment is a major breakthrough towards ISRO’s goal of demonstrating Satellite Based Quantum Communication (SBQC), where ISRO is gearing up to demonstrate the technology between two Indian ground stations.

3 responses to “ISRO Makes Breakthrough Demonstration of Free-space Quantum Key Distribution (QKD) Over 300 Meters”

  1. GaryChurch says:

    Quantum “unconditionally” secured communications make human-crewed combat aircraft obsolete. The most expensive DOD program in history- the F-35- is a boondoggle and the ultimate expression of “pork.” The most incredibly expensive waste of taxpayer dollars is not this single weapon system though, it is the replacement of legacy systems now underway to the tune of around 2 trillion dollars (adjusted for inflation over the next decade or so).

    New ICBM’s, new missile submarines, new stealth bombers, proliferation and weaponization of weapon systems in Earth orbit , new anti-ballistic weapon systems (that will not work due to simple physics) etc. etc.

    The best path is to move the nuclear arsenals of the superpowers to human-crewed spaceships months away in deep space. This would also serve to protect the Earth from impact threats and also help along Space Solar Power (using lunar factories) as the solution to the climate change crisis. All part of a Green New Space Deal.

    • duheagle says:

      With every new idiocy of the Biden Residency I can comfort myself with the notion that at least they aren’t getting their nutty ideas from you.

      • GaryChurch says:

        Birx says after the first 100,000 died of covid the rest were on Trumps head. That is who you think is so great. Someone who worships a wannabe dictator that let 400,000 people die is an idiot. Absolutely.

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