A four-crystal waveplate setup can be tuned to approximate almost any single-qubit unital channel, and is demonstrated as a controllable dephasing channel with about 97 percent process fidelity.
Experimental purification of single qubits,
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Implementation of controllable universal unital optical channels
A four-crystal waveplate setup can be tuned to approximate almost any single-qubit unital channel, and is demonstrated as a controllable dephasing channel with about 97 percent process fidelity.