Quantifying Coherence-to-Entanglement Conversion Efficiency under Noisy Operations

Researchers have made a breakthrough in understanding how local quantum coherence can be converted into bipartite entanglement under noisy conditions. A recent study examined a minimal two-qubit protocol, which involves a coherent single-qubit input, an incoherent ancilla, an ideal CNOT operation, and subsequent environmental noise. By utilizing the $l_1$-norm of coherence and entanglement negativity as metrics, the team established a precise relationship between these two quantum resources¹. This discovery sheds light on the fundamental limits of coherence-to-entanglement conversion efficiency in the presence of noise. The findings have significant implications for the development of quantum technologies, as they provide a deeper understanding of the interplay between coherence and entanglement in noisy environments. This matters to quantum practitioners because it can inform the design of more robust quantum protocols that can mitigate the effects of noise and optimize the conversion of local coherence into entanglement.