Today, someone who stores an encrypted file on a remote storage service cannot prove that the file was really deleted. Encryption stops the service from reading the file today, but it doesn't stop the service from secretly keeping a spare copy. If the decryption key later leaks, that spare becomes readable. In their paper “Semi-Quantum Cryptography with Certified Deletion,” Yael Tauman Kalai of MIT and Justin Raizes of NTT Research provide a method for a classical computer to use a quantum ser
quantumphysics (2)
Touch the back of a laptop, and the warmth you feel is energy that has already been paid for, processed by chips, and then dissipated as heat. The work by Toshimasa Fujisawa and colleagues, reported in Communications Physics as “Efficient heat-energy conversion from a non-thermal Tomonaga-Luttinger liquid” and summarized in the TechXplore piece “A new approach to energy harvesting opened up by the quantum world,” asks a simple but radical question: what if that waste heat could be turned back i
