Unambiguous preparation of Bell pairs
arxiv(2024)
摘要
The ability of preparing perfect Bell pairs with a practical scheme is of
great relevance for quantum communication as well as distributed quantum
computing. We propose a scheme which probabilistically, but unambiguously
produces the |Φ_+> Bell pair from four copies of qubit pairs
initially in the same arbitrary pure quantum state. The same scheme, extended
to eight qubit pairs initially in the same, moderately mixed quantum state,
unambiguously produces the |Φ_+> Bell pair with quadratically
suppressed noise. The core step of the proposed scheme consists of a pair of
local two-qubit operations applied at each of the two distant locations,
followed by a partial projective measurement and postselection at each party,
with results communicated classically. While the scheme resembles standard
entanglement distillation protocols, it achieves success within just three
iterations, making it attractive for real-world applications.
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