Schrödinger’s Cat Just Got Hot

What if you didn’t need freezing temperatures to create a quantum superposition? Researchers at the University of Innsbruck and IQOQI Innsbruck have achieved something groundbreaking: they created hot Schrödinger cat states, quantum superpositions observed at higher temperatures, inside a superconducting microwave resonator.

The international team – including Gerhard Kirchmair, Oriol Romero-Isart, Ian Yang, and Thomas Agrenius – showed that quantum interference can persist even in thermally excited systems. This challenges the long-standing belief that quantum effects only occur near absolute zero.

Using transmon qubits and specialized protocols, they generated distinct interference patterns at up to 1.8 Kelvin, over 60 times warmer than typical conditions. This opens new possibilities for building quantum technologies that function in less-than-perfect environments.

📚 Researchers: Gerhard Kirchmair, Oriol Romero-Isart, Ian Yang, Thomas Agrenius
🏛️ Institutions: University of Innsbruck, IQOQI Innsbruck, ICFO Barcelona

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