The NSA Probably Really, Really Wants a Quantum Computer
How long until the security agency gets one?
Jun 4 2014, 1:50 PM ET
This is huge: Physicists have figured out how to reliably transmit quantum information, a major first step toward the kind of quantum communications and quantum computing that would dramatically enhance our ability to secure networks, crack codes, and search databases.
These potential applications of quantum computing—and I'll get to what exactly that means in just a minute—help explain why government agencies ought to be interested in such technologies. And the latest news in this realm is significant. It comes from a team of nanoscience researchers at the Delft University of Technology in the Netherlands, where physicists successfully transmitted encoded quantum information from one computer chip to another, across a distance of about 10 feet.
U pitanju je ovaj rad:
Realizing robust quantum information transfer between long-lived qubit registers is a key challenge for quantum information science and technology. Here, we demonstrate unconditional teleportation of arbitrary quantum states between diamond spin qubits separated by 3 m. We prepare the teleporter through photon-mediated heralded entanglement between two distant electron spins and subsequently encode the source qubit in a single nuclear spin. By realizing a fully deterministic Bell-state measurement combined with real-time feed-forward quantum teleportation is achieved upon each attempt with an average state fidelity exceeding the classical limit. These results establish diamond spin qubits as a prime candidate for the realization of quantum networks for quantum communication and network-based quantum computing.