![]() You can think of it as the smallest possible molecule consisting of two entangled atoms (qubits, really) whose entanglement is absolute - implying, if you could peek at one of them, you would know beyond a doubt that the other one would be its twin, with the same characteristics. The most basic unit of entanglement is known as a Bell state. Quantum information science aims to understand and control the strange and sometimes spooky properties of quantum states (that is, entangled states) that enable information processing tasks that are impossible in the non-quantum world, such as teleportation, quantum computing, and absolutely secure communication. Their work closes a longstanding investigation in entanglement theory that is known as the "PPT exact entanglement cost of a quantum state." Xin Wang of Baidu Research describe how allowing a slightly wider range of physical operations than what's known as LOCC (local operations and classical communication) - which have boggled quantum scientists with difficult math for some time - makes it possible to characterize the exact entanglement cost of a given quantum state. ![]() ![]() In a new paper published in Physical Review Letters, Wilde and co-author Dr. ![]()
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