By harnessing the weird, baffling properties of entangled subatomic particles, we could someday develop computers based on quantum bits, or qubits, which are orders of magnitude more powerful than our current calculating engines and which could instantly transmit messages at great distances with uncrackable security protection. The sticking point: This has proven exceedingly difficult to accomplish, and successful experiments in quantum computing have thus far been confined to carefully controlled laboratories, not real-world environments. But scientists continue to plug away at the problem. Quantum computing on a practical scale may still be a decade or more away. But just in the past few years, researchers have developed silicon-based building blocks for a quantum computer, created the first working quantum network, used lasers and diamonds to achieve breakthroughs, and continued to set new distance records for quantum teleportation.
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