Manuscript En04-A@1 · En04-A.tex · section · bab77211

The external residual program

Readout, forgetting, and the complete apparatus › The external residual program · lines 1409–1427

The entanglement-breaking characterization is established in HorodeckiShorRuskai. The quantitative statement is proved locally. A surviving quantum memory or supplied quantum side information changes the hypothesis.

Residual measurement outcomes supplied to the observer may assist quantum recovery. For example,

V ∣ ψ ⟩ = \frac{∣ ψ ⟩ _{R} ∣ 0 ⟩ _{B} + Z ∣ ψ ⟩ _{R} ∣ 1 ⟩ _{B}}{2}

has dephasing radiation. Measuring $B$ gives a uniform bit $x$ ; applying $Z^{x}$ to $R$ recovers exactly. Dropping the bit without using it leaves dephasing. The bit alone contains no diary. This is an access change, not a record-only quantum decoder.

Displayed formulas in this passage

unlabeled · line 1418
$V ∣ ψ ⟩ = \frac{∣ ψ ⟩ _{R} ∣ 0 ⟩ _{B} + Z ∣ ψ ⟩ _{R} ∣ 1 ⟩ _{B}}{2}$

The external residual program

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