Abstract：
:We study an Ising chain undergoing a quantum phase transition in a quantum magnetic field. Such a field can be emulated by coupling the chain to a central spin initially in a superposition state. We show that--by adiabatically driving such a system--one can prepare a quantum superposition of any two ground states of the Ising chain. In particular, one can end up with the Ising chain in a superposition of ferromagnetic and paramagnetic phases--a scenario with no analogue in prior studies of quantum phase transitions. Remarkably, the resulting magnetization of the chain encodes the position of the critical point and universal critical exponents, as well as the ground state fidelity.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Rams MM,Zwolak M,Damski Bdoi
10.1038/srep00655subject
Has Abstractpub_date
2012-01-01 00:00:00pages
655issn
2045-2322journal_volume
2pub_type
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