Quantum gate arrays can be programmed to evaluate the expectation value of any operator

被引：37

作者：

Paz, JP

Roncaglia, A

机构：

[1] Univ Buenos Aires, Fac Ciencias Exactas & Nat, Dept Fis JJ Giambiagi, RA-1428 Buenos Aires, DF, Argentina

[2] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA

来源：

PHYSICAL REVIEW A | 2003年 / 68卷 / 05期

关键词：

D O I：

10.1103/PhysRevA.68.052316

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A programmable gate array is a circuit whose action is controlled by input data. In this paper we describe a special-purpose quantum circuit that can be programmed to evaluate the expectation value of any operator O acting on a space of states of N dimensions. The circuit has a program register whose state \Psi(O)>(P) encodes the operator O whose expectation value is to be evaluated. The method requires knowledge of the expansion of O in a basis of the space of operators. We discuss some applications of this circuit and its relation to known instances of quantum state tomography.

引用

页数：5

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