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## Acta Physica Polonica A

2017 | 132 | 1 | 103-105
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### Interaction Independent Quantum Probing

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Abstracts
EN
For an open quantum system we assume that we are able to set the system's environment temperature. We fix the time interval and let the system (further referred as the probing system) to evolve during this time in two different temperatures. We make a process tomography of the resulting dynamics (quantum channels ε₁,ε₂ related to the temperatures T₁ and T₂ respectively). We calculate then the values of α-fidelities for the pair of channels. We derive an inequality between the experimental data and the partition function of environment (hence the spectrum of the environment). If the inequality is not satisfied, it implies that our assumption about the spectrum of the environment is wrong. Notice that there is no dependence on the interaction terms neither on the Hamiltonian of the probing system. We show the power of this method in the following example. Consider a two-level atom passing the one-mode vacuum. We do not know the Hamiltonian of the atom (the probing system) neither the interaction mechanism. We would like to determine the frequency of the vacuum. We will show that wide range of frequencies are forbidden by the inequality.
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103-105
Physical description
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published
2017-07
References
• [1] D. Petz, Rep. Math. Phys. 23, 57 (1986), doi: 10.1016/0034-4877(86)90067-4
• [2] M.M. Wilde, A. Winter, D. Yang, Commun. Math. Phys. 331C, 593 (2014), doi: 10.1007/s00220-014-2122-x
• [3] M.A. Nielsen, I.L. Chuang,Quantum Computation and Quantum Information, Cambridge University Press, 2000, doi: 10.1017/CBO9780511976667
• [4] H.P. Breuer, F. Petruccione,The Theory of Open Quantum Systems, Vol. 1, Oxford University Press, New York 2007, p. 227, doi: 10.1093/acprof:oso/9780199213900.001.0001
• [5] M. Tukiainen, H. Lyyra, G. Sarbicki, S. Maniscalco, Fidelity of Dynamical Maps, arXiv: 1609.00482 http://arXiv.org/abs/1609.00482
Document Type
Publication order reference