English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

A mixed quantum state shared between two parties is said to be distillableif, by means of a protocol involving only local quantum operations andclassical communication, the two parties can transform some number of copies ofthat state into a single shared pair of qubits having high fidelity with amaximally entangled state state. In this paper it is proved that there existstates that are distillable, but for which an arbitrarily large number ofcopies is required before any distillation procedure can produce a shared pairof qubits with even a small amount of entanglement. Specifically, for everypositive integer n there exists a state that is distillable, but given n orfewer copies of that state every distillation procedure outputting a singleshared pair of qubits will output those qubits in a separable state.Essentially all previous examples of states proved to be distillable were suchthat some distillation procedure could output an entangled pair of qubits givena single copy of the state in question.Comment: 4 pages; major revisions, title changed, main result unchanged.  Accepted for publication in PR

Many Copies May Be Required for Entanglement Distillation