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Keywords = quantum Bernoulli noises

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16 pages, 330 KB  
Article
Interacting Stochastic Schrödinger Equation
by Lu Zhang, Caishi Wang and Jinshu Chen
Mathematics 2023, 11(6), 1388; https://doi.org/10.3390/math11061388 - 13 Mar 2023
Cited by 1 | Viewed by 1442
Abstract
Being the annihilation and creation operators on the space h of square integrable Bernoulli functionals, quantum Bernoulli noises (QBN) satisfy the canonical anti-commutation relation (CAR) in equal time. Let K be the Hilbert space of an open quantum system interacting with QBN (the [...] Read more.
Being the annihilation and creation operators on the space h of square integrable Bernoulli functionals, quantum Bernoulli noises (QBN) satisfy the canonical anti-commutation relation (CAR) in equal time. Let K be the Hilbert space of an open quantum system interacting with QBN (the environment). Then Kh just describes the coupled quantum system. In this paper, we introduce and investigate an interacting stochastic Schrödinger equation (SSE) in the framework Kh, which might play a role in describing the evolution of the open quantum system interacting with QBN (the environment). We first prove some technical propositions about operators in Kh. In particular, we obtain the spectral decomposition of the tensor operator IKN, where IK means the identity operator on K and N is the number operator in h, and give a representation of IKN in terms of operators IKkk, k0, where k and k are the annihilation and creation operators on h, respectively. Based on these technical propositions as well as Mora and Rebolledo’s results on a general SSE, we show that under some mild conditions, our interacting SSE has a unique solution admitting some regularity properties. Some other results are also proven. Full article
17 pages, 302 KB  
Article
Higher-Dimensional Quantum Walk in Terms of Quantum Bernoulli Noises
by Ce Wang and Caishi Wang
Entropy 2020, 22(5), 504; https://doi.org/10.3390/e22050504 - 28 Apr 2020
Cited by 2 | Viewed by 2701
Abstract
As a discrete-time quantum walk model on the one-dimensional integer lattice Z , the quantum walk recently constructed by Wang and Ye [Caishi Wang and Xiaojuan Ye, Quantum walk in terms of quantum Bernoulli noises, Quantum Information Processing 15 (2016), 1897–1908] exhibits quite [...] Read more.
As a discrete-time quantum walk model on the one-dimensional integer lattice Z , the quantum walk recently constructed by Wang and Ye [Caishi Wang and Xiaojuan Ye, Quantum walk in terms of quantum Bernoulli noises, Quantum Information Processing 15 (2016), 1897–1908] exhibits quite different features. In this paper, we extend this walk to a higher dimensional case. More precisely, for a general positive integer d 2 , by using quantum Bernoulli noises we introduce a model of discrete-time quantum walk on the d-dimensional integer lattice Z d , which we call the d-dimensional QBN walk. The d-dimensional QBN walk shares the same coin space with the quantum walk constructed by Wang and Ye, although it is a higher dimensional extension of the latter. Moreover we prove that, for a range of choices of its initial state, the d-dimensional QBN walk has a limit probability distribution of d-dimensional standard Gauss type, which is in sharp contrast with the case of the usual higher dimensional quantum walks. Some other results are also obtained. Full article
(This article belongs to the Special Issue Quantum Probability and Randomness II)
11 pages, 284 KB  
Article
A New Limit Theorem for Quantum Walk in Terms of Quantum Bernoulli Noises
by Caishi Wang, Suling Ren and Yuling Tang
Entropy 2020, 22(4), 486; https://doi.org/10.3390/e22040486 - 24 Apr 2020
Cited by 4 | Viewed by 3059
Abstract
In this paper, we consider limit probability distributions of the quantum walk recently introduced by Wang and Ye (C.S. Wang and X.J. Ye, Quantum walk in terms of quantum Bernoulli noises, Quantum Inf. Process. 15 (2016), no. 5, 1897–1908). We first establish several [...] Read more.
In this paper, we consider limit probability distributions of the quantum walk recently introduced by Wang and Ye (C.S. Wang and X.J. Ye, Quantum walk in terms of quantum Bernoulli noises, Quantum Inf. Process. 15 (2016), no. 5, 1897–1908). We first establish several technical theorems, which themselves are also interesting. Then, by using these theorems, we prove that, for a wide range of choices of the initial state, the above-mentioned quantum walk has a limit probability distribution of standard Gauss type, which actually gives a new limit theorem for the walk. Full article
(This article belongs to the Special Issue Quantum Information Processing)
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