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

Goldberg, Aaron Z.; Heshami, Khabat

doi:10.1088/2399-6528/acb414

Cited by 5 publications

(1 citation statement)

References 87 publications

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“…Experimental realizability of these protocols is of high importance here, and a cooling cycle with quantum-controlled thermalization has been already implemented in several table-top experiments. Beyond the reviewed protocols, quantum SWITCH allows one to outperform heat-bath algorithmic cooling technique [20] and boost the charging process of a quantum battery [21].…”

Section: Discussion and Outlookmentioning

confidence: 99%

Indefinite causality in quantum mechanics and its thermodynamic applications

Simonov

2023

J. Phys.: Conf. Ser.

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The nature of causality remains one of the key puzzles in science. In quantum theory, the causal structure is not subject to quantum uncertainty and plays rather a background role. One can ask whether the background causal structure can be dropped, for example, by respecting causality only locally. Such scenarios of local validity of quantum theory while relaxing the global definite causal order of operations can be described via the machinery of process matrices. An important example of scenarios of this kind is quantum SWITCH, a process realizing a quantum superposition of causal orders of operations. Looking for the possible applications of quantum SWITCH has been the subject of growing interest in the scientific community as it could provide communication and computational resources not realizable via standard quantum theory. In the last few years, the benefits potentially offered by quantum SWITCH for thermodynamic tasks have appeared in the spotlight. This contribution aims at reviewing the recent proposals of thermodynamic applications of quantum SWITCH and draw the perspectives.

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Section: Discussion and Outlookmentioning

confidence: 99%

Indefinite causality in quantum mechanics and its thermodynamic applications

Simonov

2023

J. Phys.: Conf. Ser.

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Experimentally Demonstrating Indefinite Causal Order Algorithms to Solve the Generalized Deutsch's Problem

Liu,

Meng,

Song

et al. 2024

Adv Quantum Tech

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Deutsch's algorithm is the first quantum algorithm to demonstrate an advantage over classical algorithms. Here, Deutsch's problem is generalized to functions and a quantum algorithm with an indefinite causal order is proposed to solve this problem. The algorithm not only reduces the number of queries to the black box by half compared to the classical algorithm, but also significantly decreases the complexity of the quantum circuit and the number of required quantum gates compared to the generalized Deutsch's algorithm. The algorithm is experimentally demonstrated in a stable Sagnac loop interferometer with a common path, which overcomes the obstacles of both phase instability and low fidelity of the Mach–Zehnder interferometer. The experimental results show both ultrahigh and robust success probabilities . This study opens a path toward solving practical problems with indefinite cause‐order quantum circuits.

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