Breaking the limits of purification: Postselection enhances heat-bath
algorithmic cooling
- URL: http://arxiv.org/abs/2108.08853v3
- Date: Thu, 9 Feb 2023 00:27:28 GMT
- Title: Breaking the limits of purification: Postselection enhances heat-bath
algorithmic cooling
- Authors: Aaron Z. Goldberg and Khabat Heshami
- Abstract summary: Quantum technologies require pure states, which are often generated by extreme refrigeration.
Heat-bath algorithmic cooling is the theoretically optimal refrigeration technique.
We show how to surpass this hitherto-optimal technique by taking advantage of a single binary-outcome measurement.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: 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.
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