Unanswered Questions
2,371 questions with no upvoted or accepted answers
0
votes
0
answers
130
views
The difference between the unitary matrix in ProjectQ and Qiskit
Why are not the same unitary matrices in ProjectQ and Qiskit in the following codes:
ProjectQ:
...
- 5,969
0
votes
0
answers
172
views
Coherence measurement for density matrix
I have a density matrix of the form:
$$\rho(t)=\left[
\begin{array}{ccc}
\frac{1}{4}+\frac{1}{12} e^{-\frac{2 \tau ^{2 H+2}}{2 H+2}} & \frac{1}{3} & \frac{1}{4}+\frac{1}{12} e^{-\frac{2 \tau ^...
- 11
0
votes
0
answers
84
views
Compilation with ScaffCC compared to Qiskit's Transpiler
I am new to ScaffCC and wanted to ask if ScaffCC has the ability to compile a program to a limited connectivity machine? Similar to Qiskit's Transpiler ability?
- 43
0
votes
0
answers
90
views
Prove that autocompatible LCPT maps are antidegradable
A LCPT map $\Phi$ is antidegradable if and only if it is compatible with itself.
The proof that an antidegradable map (satisfying $\Phi=\Lambda_E\circ \tilde\Phi$ where $\tilde\Phi$ is the ...
- 173
0
votes
0
answers
64
views
How to connect the idea of inner product, outer product, matrix element in 3 level composite system?
I was solving steady state solution given by Lindblad equation, and I got stuck on the calculation part like what will be the value of $\langle e, 0|b, 0\rangle$?
And how should I rewrite $|d, 0\...
- 14.9k
0
votes
0
answers
88
views
How to access/ read $\alpha$ and $\beta$ values of a certain qubit in a multi-qubit system in a for loop?
In order to rotate the qubit state I need first to be able to read the values of $\alpha$ and $\beta$ and based on their values I will apply the Q-Gate for rotating the states of the single Qubits in ...
- 13
0
votes
0
answers
29
views
What is an example of numbers that when used for a Gaussian pulse, would result in a rotation about the x axis?
For the playing of a Gaussian pulse, what is an example of numbers that could be plugged in for duration, amp, and sigma that would result in the pulse rotating something about the x axis?
Here is the ...
glS♦
- 26.9k
0
votes
1
answer
171
views
How to get information about 'qubit location' or 'variable of qubit location' in qiskit docs?
I have something problem with using qiskit.
I searched several qiskit docs to get 'qubit location' or 'variables' that represent qubit.
I searched three documents below.
...
CommunityBot
- 1
0
votes
0
answers
342
views
How does the amplitude amplification in Grover's algorithm work?
As the question says - how does the amplitude amplification in Grover's algorithm work?
I am fine with adding the negative phase on the winning state, but how does one generate the diffuser to ...
- 3,109
0
votes
1
answer
124
views
How to use backend.run() with a constant pulse shape in order to get the results of a measurement?
I have formed a constant pulse and then I ran a measurement on the pulse. Now, I want to run a job to access the results of the measurement. Attached is a picture of the pulse and measurement. Now, at ...
CommunityBot
- 1
0
votes
0
answers
90
views
Qiskit equivalent of get_expectation_value() in ProjectQ
Is there a corresponding function that has the same function as function get_expectation_value() in Project Q?
Get the expectation value of qubit_operator w.r.t. the current wave function ...
- 5,112
0
votes
0
answers
98
views
How do you build the modified Toffoli gate using only local unitary and CNOT operations?
How do you build a circuit for a modified Toffoli gate using only local unitary operations and CNOT operations? The two-qubit unitary operation is given by: $\text{diag}\{1, 1, 1, e^{i\phi}\}$.
glS♦
- 26.9k
0
votes
0
answers
90
views
How to simplify a circuit with repeated same parts?
If I have a circuit with 3 qubits and repeated gates as follow:
...
- 2,603
0
votes
0
answers
41
views
Process Tomography for Blind Quantum Computation
Process Tomography can identify the quantum channel, while Blind Quantum Computation strives to hide the inputs using quantum gates.
Given the user executes the same blind circuit multiple times (of ...
- 323
0
votes
0
answers
161
views
Is there a simple quantum gate that shows off the power of Quantum interference?
I'm trying to build a deep understanding of where the power of quantum computing comes from when compared to probabilistic computing. A naive observation might be that probabilistic computing would be ...
- 101