Questions tagged [quantum-process-tomography]
For all questions regarding quantum process tomography or derivatives thereof (like gate-set tomography). In quantum process tomography, processes that are performed on qubits are characterized rather than the state of the qubits themselves; see quantum state tomography for this.
7
questions
11
votes
1
answer
1k
views
What is the relationship between Choi and Chi matrix in Qiskit?
I'm struggling with the framework for quantum process tomography on Qiskit.
The final step of such a framework is running fit method of ...
- 1,300
5
votes
1
answer
958
views
How to perform Quantum Process Tomography for three qubit gates?
I am trying to perform Quantum process tomography (QPT) on three qubit quantum gate. But I cannot find any relevant resource to follow and peform the experiment. I have checked Nielsen and Chuang's ...
3
votes
1
answer
142
views
Does any quantum channel satisfy ${\rm Tr}(\mathcal E^\dagger \mathcal E) \in[0, d^2]$?
I am reading the paper "Direct Fidelity Estimation from Few Pauli Measurements".
According to the paper, the entanglement fidelity between the a unitary channel $\mathcal U$ and a quantum ...
- 357
3
votes
2
answers
232
views
Why does the $\chi$ matrix have $d^4-d^2$ independent parameters?
In the section on Quantum process tomography, Page 391, Chapter 8, Quantum Computation and Quantum Information by Nielsen and Chuang. it is given that
In general, $\chi$ will contain $d^4−d^2$ ...
- 721
2
votes
0
answers
68
views
What is the best method for estimating average channel fidelity?
This thesis shows an efficient way to estimate average channel fidelity (in chapter 4). However, it is somewhat old (from 2005). Are there any better methods out there? By better I mean: are there ...
- 1,331
1
vote
1
answer
142
views
How to derive the number of independent parameters in the $\chi$ matrix from the Choi matrix?
In the section on Quantum process tomography, Page 391, Chapter 8, Quantum Computation and Quantum Information by Nielsen and Chuang. it is given that
In general, $\chi$ will contain $d^4−d^2$ ...
- 721
1
vote
0
answers
87
views
In quantum process tomography for one and two qubit, why can we express the $\chi$ matrix in this form?
I'm reading Nielsen and Chuang and I read quantum tomography process given by N&C (box 8.5), which provides an algorithm for determining $\chi$ in terms of block matrices and density matrices. And ...
- 67