Breaking the limits of purification: postselection enhances heat-bath algorithmic cooling

Quantum technologies require pure states, which are often generated by extreme refrigeration. Heat-bath algorithmic cooling is the theoretically optimal refrigeration technique: it shuttles entropy from a multiparticle system to a thermal bath, thereby generating a quantum state with a high degree o...

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Bibliographic Details
Published in:Journal of physics communications 2023-01, Vol.7 (1), p.15003
Main Authors: Goldberg, Aaron Z, Heshami, Khabat
Format: Article
Language:English
Subjects:
heat bath algorithmic cooling
postselection
purification
quantum refrigeration
quantum thermodynamics
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Summary:Quantum technologies require pure states, which are often generated by extreme refrigeration. Heat-bath algorithmic cooling is the theoretically optimal refrigeration technique: it shuttles entropy from a multiparticle system to a thermal bath, thereby generating a quantum state with a high degree of purity. Here, we show how to surpass this hitherto-optimal technique by taking advantage of a single binary-outcome measurement. Our protocols can create arbitrary numbers of pure quantum states without any residual mixedness by using a recently discovered device known as a quantum switch to put two operations in superposition, with postselection certifying the complete purification.
ISSN:2399-6528
2399-6528
DOI:10.1088/2399-6528/acb414