Quantum information theory

Some quantum cryptographers want to find ways to keep messages secret even if the rules of quantum mechanics don’t hold. The recently rediscovered idea of quantum jamming complicates things.

Two research groups say they have significantly reduced the amount of qubits and time required to crack common online security technologies.

Charles Bennett and Gilles Brassard were recognized for their foundational work in quantum information science.

The supercollider is now being used to explore quantum phenomena, including a “magic” form of quantum entanglement.

“Anomalous” heat flow, which at first appears to violate the second law of thermodynamics, gives physicists a way to detect quantum entanglement without destroying it.

In theory, quantum physics can bypass the hard mathematical problems at the root of modern encryption. A new proof shows how.

In a first, researchers have shown that adding more “qubits” to a quantum computer can make it more resilient. It’s an essential step on the long road to practical applications.

While devising a new quantum algorithm, four researchers accidentally established a hard limit on entanglement.

Cryptography is the thread that connects Julius Caesar, World War II and quantum computing, and it now lies under nearly every part of modern life. In this week’s episode, computer scientist Boaz Barak and co-host Janna Levin discuss the past and future of secrecy.