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Is Complete Positive Trace Preserving Map (CPTP) same as Are CPTP operators and unitary operationsoperators the same thing?

I am reading some quantum papers (In particular, this one page 34) . One of the theorem statement reads,

 "For every CPTP operator M, we have that .... " 

I know that we usually apply unitary operations on quantum states. Is CPTPcompletely positive trace preserving (CPTP) operator same as unitary operationoperator? What's the difference between them? What's the advantage of proving theorems for CPTP operators rather than unitary operators?

Is Complete Positive Trace Preserving Map (CPTP) same as unitary operations?

I am reading some quantum papers (In particular, this one page 34) . One of the theorem statement reads,

 "For every CPTP operator M, we have that .... " 

I know that we usually apply unitary operations on quantum states. Is CPTP operator same as unitary operation? What's the difference between them? What's the advantage of proving theorems for CPTP operators rather than unitary operators?

Are CPTP operators and unitary operators the same thing?

I am reading some quantum papers (In particular, this one page 34) . One of the theorem statement reads,

 "For every CPTP operator M, we have that .... " 

I know that we usually apply unitary operations on quantum states. Is completely positive trace preserving (CPTP) operator same as unitary operator? What's the difference between them? What's the advantage of proving theorems for CPTP operators rather than unitary operators?

1
source | link

Is Complete Positive Trace Preserving Map (CPTP) same as unitary operations?

I am reading some quantum papers (In particular, this one page 34) . One of the theorem statement reads,

 "For every CPTP operator M, we have that .... " 

I know that we usually apply unitary operations on quantum states. Is CPTP operator same as unitary operation? What's the difference between them? What's the advantage of proving theorems for CPTP operators rather than unitary operators?