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Researchers Demonstrate New Building Block in Quantum Computing


An illustration of the quantum frequency processor.

Researchers with the U.S. Department of Energys Oak Ridge National Laboratory have demonstrated a new level of control over photons encoded with quantum information.

Credit: Oak Ridge National Laboratory

Researchers at the U.S. Department of Energy's Oak Ridge National Laboratory (ORNL) have demonstrated a new level of control over photons encoded with quantum data.

The team conducted distinct, independent operations concurrently on two quantum bits (qubits) encoded on light particles of differing frequencies, a key capability in linear optical quantum computing.

Said ORNL's Pavel Lougovski, "To realize universal quantum computing, you need to be able to do different operations on different qubits at the same time, and that's what we've done here."

He said the system, consisting of two entangled photons within a single strand of fiber-optic cable, is the "smallest quantum computer you can imagine."

Using a quantum frequency processor, the researchers manipulated the photons' frequency to induce superposition, facilitating quantum operations and computing.

The team achieved 97% interference visibility versus the 70% visibility rate from similar studies, indicating near-identical photonic quantum states.

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