Engineering Four-Qubit Fuel States for Protecting Quantum Thermalization Machine from Decoherence

Round 1

Reviewer 1 Report

Comments and Suggestions for Authors

Please see the report attached and revise the manuscript accordingly.

Comments for author File: Comments.pdf

Comments on the Quality of English Language

Author Response

(Please see the attached file.)

Author Response File: Author Response.docx

Reviewer 2 Report

Comments and Suggestions for Authors

This paper proposes a study of a four-qubit quantum system as the resource for fueling a quantum thermalization machine where specific coherence terms can control the effective temperature of the machine. For the four-qubit atomic fuel system, a classical mixture of quantum Dicke and W states was designed with the mixture probability as the control parameter. The authors claim that although the work focused on quantum systems of four-qubits, it can be easily adapted to any number of qubits by analyzing the heat-exchange coherence terms of the density matrix, and the effect of the decoherence on the density matrix.

The authors are interested in the pure thermalization of the cavity field meaning that in addition to the squeezing terms, the coherence displacement terms must also vanish because coherence would destroy the chaotic nature of the cavity field, interrupting thermalization. In this case the density matrix of the four-qubit state to consist of heat exchange terms only, plus the population terms required to construct a valid density matrix. The analysis of the global density matrix elements is done by asking what kind of four-qubit quantum system contributes to the coherences without introducing the squeezing or coherent-injection terms the answer is considering to four-qubit Dicke states with two excitations.

The paper brings up some novel end interesting ideas.

 

Comments on the Quality of English Language

English language should be thoroughly checked.

Several mispellings detected.

Author Response

(Please see the attached file.)

Author Response File: Author Response.docx

Round 2

Reviewer 1 Report

Comments and Suggestions for Authors

I am very satisfied with the reponse of the authors. All of my comments have been addressed adequately. I think the paper can be accepted for publication in the present form.

Comments on the Quality of English Language

English is fine