Quantum Echoes: the algorithm that reverses time and threatens crypto

Quantum Echoes: the quantum algorithm that reverses time and puts Bitcoin on notice

Google has once again put quantum computing at the center of the board. Its Willow chip has demonstrated the first verifiable quantum advantage by running an algorithm that, according to its creators, can reverse the spread of information in a quantum system. They have called it Quantum Echoes. Two studies published in parallel show how this technique could bring practical applications of quantum computing, such as determining molecular structures, within reach in as little as five years.

What are quantum echoes and why do they matter?

The concept sounds like science fiction, but it is a firm step toward correcting errors in quantum systems. Google's Willow chip has managed to run an algorithm that reverses time in the sense of quantum dispersion, allowing information that would otherwise have been lost to be recovered. This is key to quantum computers moving from laboratory toys to useful tools. However, not everyone is applauding. Industry insiders point out that, today, quantum computing is barely good for four things: it is sold to companies to justify spending and attract European funding, and above all, to inflate share prices.

The bombshell for cryptocurrencies

But the real earthquake anticipated by quantum advances is the breaking of current cryptography. Both the California Institute of Technology and Google's AI group have warned that cracking the security algorithms of Bitcoin or Ethereum with a quantum computer would be a matter of minutes. Estimates suggest it will take roughly two years and ten months before quantum computing can break the encryption of any cryptocurrency. A timeframe that, if it holds, would render the decentralized financial system obsolete as we know it.

The paradox is that, while tech giants move forward, retail investors keep buying crypto without paying attention to the looming threat. Some even claim to have invested large sums in quantum without having any idea what it is or what it is for. Something that, judging by how things look, could prove costly.