We show here that the recent work of Wolf and Wullschleger (quant-ph/0502030) on oblivious transfer apparently opens the possibility that non-local correlations which are stronger than those in quantum mechanics could be used for bit-commitment. This is surprising, because it is the very existence of non-local correlations which in quantum mechanics prevents bit-commitment. We resolve this apparent paradox by stressing the difference between non-local correlations and oblivious transfer, based on the time-ordering of their inputs and outputs, which prevents bit-commitment.
|Translated title of the contribution||The physics of no-bit-commitment: Generalized quantum non-locality versus oblivious transfer|
|Pages (from-to)||131 - 138|
|Number of pages||8|
|Journal||Quantum Information Processing|
|Publication status||Published - Apr 2006|