Lindbladian purification
Lindbladian purification
复制标题
林布拉德纯化
DOI:
10.1088/2058-9565/aa6759
复制
发表时间:
2017
影响因子:
6.7
通讯作者:
Arenz C
中科院分区:
文献类型:
--
作者:
Arenz C
In a recent work (Burgarth et al 2014, Nat. Commun. 5 5173), it was shown that a series of frequent measurements can project the dynamics of a quantum system onto a subspace in which the dynamics can be more complex. In this subspace, even full controllability can be achieved, although the controllability over the system before the projection is very poor since the control Hamiltonians commute with each other. We can also think of the opposite: any Hamiltonians of a quantum system, which are in general noncommutative with each other, can be made commutative by embedding them in an extended Hilbert space, thus the dynamics in the extended space becomes trivial and simple. This idea of making noncommutative Hamiltonians commutative is called'Hamiltonian purification.'The original noncommutative Hamiltonians are recovered by projecting the system back onto the original Hilbert space through frequent measurements. Here, we generalise this idea to open-system dynamics by presenting a simple construction to make Lindbladians, as well as Hamiltonians, commutative on a larger space with an auxiliary system. We show that the original dynamics can be recovered through frequently measuring the auxiliary system in a non-selective way. Moreover, we provide a universal pair of Lindbladians that describe an'accessible'open quantum system for generic system sizes. This allows us to conclude that through a series of frequent non-selective measurements a nonaccessible open quantum system generally becomes accessible. This sheds further light on the role of measurement backaction on the control of quantum systems.
登录
查看更多内容
影响因子:
2.9
作者:
Arenz C
通讯作者:
Arenz C
影响因子:
6.4
作者:
Davide Orsucci;D. Burgarth;P. Facchi;H. Nakazato;S. Pascazio;K. Yuasa;V. Giovannetti
通讯作者:
V. Giovannetti
DOI:
10.1073/pnas.45.10.1542
发表时间:
1959-01-01
影响因子:
11.1
作者:
SCHWINGER, J
通讯作者:
SCHWINGER, J
影响因子:
2.9
作者:
Bondar, Denys I.;Cabrera, Renan;Rabitz, Herschel A.
通讯作者:
Rabitz, Herschel A.
DOI:
--
发表时间:
2009
期刊:
影响因子:
--
作者:
G. Dirr;U. Helmke;I. Kurniawan;T. Schulte
通讯作者:
T. Schulte