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A frequency domain condition for the physical realizability of linear quantum systems
Published in
2012
Volume: 57
   
Issue: 8
Pages: 2033 - 2044
Abstract
A recently emerging approach to the feedback control of linear quantum systems involves the use of a controller which itself is a quantum linear system. This approach to quantum feedback control, referred to as coherent quantum feedback control, has the advantage that it does not destroy quantum information, is fast, and has the potential for efficient implementation. An important issue which arises both in the synthesis of linear coherent quantum controllers and in the modeling of linear quantum systems, is the issue of physical realizability. This issue relates to the property of whether a given set of linear quantum stochastic differential equations corresponds to a physical quantum system satisfying the laws of quantum mechanics. Under suitable assumptions, the paper shows that the question of physical realizability is equivalent to a frequency domain (J,J) -unitary condition. This is important in controller synthesis since it is the transfer function matrix of the controller which determines the closed loop system behavior. © 2012 IEEE.
About the journal
JournalIEEE Transactions on Automatic Control
ISSN00189286
Open AccessNo
Concepts (20)
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    Closed loops
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    Controller synthesis
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    Efficient implementation
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    FREQUENCY DOMAIN CONDITIONS
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    Frequency domains
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    LINEAR QUANTUM SYSTEMS
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    PHYSICAL REALIZABILITY
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    QUANTUM FEEDBACK CONTROL
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    Quantum information
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    QUANTUM LINEAR SYSTEMS
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    QUANTUM STOCHASTIC DIFFERENTIAL EQUATIONS
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    Quantum system
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    TRANSFER FUNCTION MATRIX
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    Closed loop systems
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    Frequency domain analysis
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    Linear systems
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    Quantum electronics
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    Stochastic systems
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    Transfer functions
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    Quantum optics