scholarly journals Linear quantum feedback networks

2008 ◽  
Vol 78 (6) ◽  
Author(s):  
J. E. Gough ◽  
R. Gohm ◽  
M. Yanagisawa
Keyword(s):  
Quantum Feedback ◽  
Feedback Networks ◽  
Linear Quantum

scholarly journals Squeezing components in linear quantum feedback networks

2010 ◽  
Vol 81 (2) ◽  
Author(s):  
J. E. Gough ◽  
M. R. James ◽  
H. I. Nurdin
Keyword(s):  
Quantum Feedback ◽  
Feedback Networks ◽  
Linear Quantum

scholarly journals The Global versus Local Hamiltonian Description of Quantum Input-Output Theory

2015 ◽  
Vol 22 (02) ◽  
pp. 1550009 ◽  
Author(s):  
John Gough
Keyword(s):  
Equivalent Form ◽  
Translation Operator ◽  
Multiple Quantum ◽  
Simple Argument ◽  
Fermi Systems ◽  
Hamiltonian Description ◽  
Input Field ◽  
Quantum Feedback ◽  
Free Translation ◽  
Feedback Networks

The aim of this paper is to derive the global Hamiltonian form for a quantum system and bath, or more generally a quantum network with multiple quantum input field connections, based on the local descriptions. We give a new simple argument which shows that the global Hamiltonian for a single Markov component arises as the singular perturbation of the free translation operator. We show that the Fermi analogue takes an equivalent form provided the parity of the coefficients is correctly specified. This allows us to immediately extend the theory of quantum feedback networks to Fermi systems.

Quantum Feedback Networks

2007 ◽  
Author(s):  
John Gough ◽  
Matthew R. James
Keyword(s):  
Quantum Feedback ◽  
Feedback Networks

scholarly journals On structure-preserving transformations of the Itō generator matrix for model reduction of quantum feedback networks

2012 ◽  
Vol 370 (1979) ◽  
pp. 5422-5436 ◽  
Author(s):  
Hendra I. Nurdin ◽  
John E. Gough
Keyword(s):  
Model Reduction ◽  
Degrees Of Freedom ◽  
Generator Matrix ◽  
Structure Preserving ◽  
Adiabatic Elimination ◽  
Quantum Feedback ◽  
Feedback Networks ◽  
Generator Matrices ◽  
Standard Operations ◽  
Internal Connections

Two standard operations of model reduction for quantum feedback networks, elimination of internal connections under the instantaneous feedback limit and adiabatic elimination of fast degrees of freedom, are cast as structure-preserving transformations of Itō generator matrices. It is shown that the order in which they are applied is inconsequential.

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