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Deutsch's condition is not specific to quantum physics, nor does it depend on the quantum nature of a physical system so that it can be fulfilled.
In consequence, Tolksdorf and Verch argue that Deutsch's condition is not sufficiently specific to allow statements about time travel scenarios or their hypothetical realization by quantum physics.
=== Lloyd's prescription ===
An alternative proposal was later presented by [[Seth Lloyd]]<ref>{{cite journal
| last1 = Lloyd
| first1 = Seth
| authorlink1 = Seth Lloyd
| last2 = Maccone
| first2 = Lorenzo
| authorlink2 = Lorenzo Maccone
| last3 = Garcia-Patron
| first3 = Raul
| authorlink3 = Raul Garcia-Patron
| last4 = Giovannetti
| first4 = Vittorio
| authorlink4 = Giovannetti Vittorio
| last5 = Shikano
| first5 = Yutaka
| authorlink5 = Yutaka Shikano
| last6 = Pirandola
| first6 = Stefano
| authorlink6 = Stefano Pirandola
| last7 = Rozema
| first7 = Lee A.
| authorlink7 = Lee A. Rozema
| last8 = Darabi
| first8 = Ardavan
| authorlink8 = Ardavan Darabi
| last9 = Soudagar
| first9 = Yasaman
| authorlink9 = Yasaman Soudagar
| last10 = Shalm
| first10 = Lynden K.
| authorlink10 = Lynden K. Shalm
| last11 = Steinberg
| first11 = Aephraim M.
| authorlink11 = Aephraim M. Steinberg
| date = 27 January 2011
| title = Closed Timelike Curves via Postselection: Theory and Experimental Test of Consistency
| journal = Physical Review Letters
| volume = 106
| issue = 4
| pages = 040403
| doi = 10.1103/PhysRevLett.106.040403
|bibcode = 2011PhRvL.106d0403L
|arxiv = 1005.2219
| pmid=21405310
| s2cid = 18442086
}}</ref><ref>{{cite journal
| last1 = Lloyd
| first1 = Seth
| authorlink1 = Seth Lloyd
| last2 = Maccone
| first2 = Lorenzo
| authorlink2 = Lorenzo Maccone
| last3 = Garcia-Patron
| first3 = Raul
| authorlink3 = Raul Garcia-Patron
| last4 = Giovannetti
| first4 = Vittorio
| authorlink4 = Giovannetti Vittorio
| last5 = Shikano
| first5 = Yutaka
| authorlink5 = Yutaka Shikano
| year = 2011
| title = The quantum mechanics of time travel through post-selected teleportation
| arxiv = 1007.2615
| doi=10.1103/PhysRevD.84.025007
| volume=84
| issue=2
| pages = 025007
| journal=Physical Review D
| bibcode= 2011PhRvD..84b5007L
| s2cid = 15972766
}}</ref> based upon [[post-selection]] and path integrals. In particular, the path integral is over single-valued fields, leading to self-consistent histories.
== In popular culture ==
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