# Questions tagged [state-tomography]

For questions about quantum state tomography, that is, the process of fully characterizing a quantum state from experimental measurements.

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### Finding the "dual" basis of an overcomplete basis for Quantum State Tomography

This question is related to this stack exchange post: What does the POVM corresponding to single-qubit state tomography look like? From what I understand, when we are interested in reconstructing a ...
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### Why can't we do pure state tomography using interference with a known reference state?

I am new to quantum tomography, and right now I am trying to understand tomography with pure states. It's my understanding if we have the amplitude magnitudes as well as relative phases, we can ...
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### Why we use random state to simulate in tomography?

To simulate tomography, we often chose a random state from the Haar measure. But why? If you have any reference for the specific reason, please let me know.
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### Error: cannot pickle '_global_parameters' object while performing state tomography with qiskit [closed]

Qiskit version: 0.44.2 Operating system: 64-bit operating system, Windows 10 Pro ...
1 vote
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### Is there a tight operator frame that is also a POVM?

We define the tight operator frame as a set of operators $\{E_i\}_{i=1}^{n}$ satisfying \sum_{i=1}^n \vert \langle \langle E_i \vert X \rangle \rangle \vert^2 = C \Vert V \Vert_2^2, \...
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### Global vs local: global density matrix and all the reduced density matrix

I prepare a $n$-qubit quantum state $\sigma$ whose ideal state is $\rho$, then perform state tomography on all the $m$- qubit reduced states. Ideally, I find that all the $m$- qubit reduced states are ...
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### Change of basis on a per vector component level

Suppose we have an $n$-qubit quantum state in the computational basis encoded in a classical blackbox function $f(x)$. That is, with $x \in \{0,1\}^n$ we can query $f$ and get the respective ...
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### Qiskit experiments on qiskit IBM runtime [duplicate]

I'm trying to perform a state tomography on a quantum circuit using Qiskit experiments. I was able to perform the tomography on the AerSimulator but have still not been able to do the tomography on ...
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### state_tomography_circuits error

I build a QuantumCircuit named qc, I want to generate state tomography circuits to evaluate fidelity of simulation. I used code, ...
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### Ensemble state identification from ensemble state distinction

I am trying to derive Fact 5. in paper 1: Let $\mathscr{E}=\{\sigma_1,.., \sigma_m\}$ be an ensemble of quantum states in $\mathbb{C}^n$. If there is a POVM $\mathscr{M}$ for the state distinction ...
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### Why is state discrimination possible to infidelity $\delta$ using $n=\Theta(1/\delta)$ states?

In (Haah et al. 2015), in the first section, the authors study the asymptotic behaviours of fidelity and trace distance between $\rho^{\otimes n}$ and $\sigma^{\otimes n}$ for some given pair of ...
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1 vote