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Newest 'qiskit' Questions - Quantum Computing Stack Exchange
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Learn more about TeamsQuestions tagged [qiskit]
Qiskit is an open source SDK for working with quantum computers at the level of pulses, circuits and application modules. If appropriate, also use the [programming] tag. Please include the version of Qiskit you use when using this tag.
2,603 questions
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Is the Casimir effect a result of quantum fluctuations in the Maxwell field?
Since the Maxwell field describes electromagnetic waves, and quantum mechanics tells us the vacuum has zero-point energy due to Heisenberg's uncertainty principle —
can the Casimir effect be directly ...
0
votes
0
answers
48
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Qiskit versions:
I am taking a course of quantum computing, and as it is old, i have been using other imports. For example, now instead of from qiskit import Aer, you need to import from qiskit_aer import Aer(I have ...
1
vote
1
answer
128
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Low Fidelity For QFT on IBM
I implemented a 5-qubit QFT circuit using Qiskit and performed quantum state tomography using an IBM backend. However, the reported process fidelity is only ~20%, which seems very low. I am trying to ...
0
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1
answer
45
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0
votes
1
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52
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How to construct an oracle and flips the phase of the solution bit strings?
I am trying to solve the boolean problem (x1 or x2) and (~x1 or ~x2 or x3) using Grover's algorithm. The only measured bits are q0, q1, and q2. This is my oracle:
...
2
votes
1
answer
92
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Getting error when importing qiskit_algorithms in latest QISKIT version 2.1.0
Recently I have upgraded my qiskit version from v1.4.3 to v 2.1.0 but when I import the qiskit_algorithms package I get the following error:
ImportError: cannot import name 'BaseSampler' from 'qiskit....
2
votes
1
answer
68
views
How to calculate the reduced density matrices using Qiskit Nature?
I need to compute the reduced density matrices (1-RDM & 2-RDM) for some molecules. As the simplest molecule, I tried to compute 1-RDM for Hydrogen using Qiskit Nature. The following is the code, ...
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0
answers
36
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Not able to setup QIskit 2.0 setup
hope all are doing well. I need your help in account set up Qiskit 2.0 in the local machine. Tried but not able to succeed. Your help is well appreciated
Thanks,
Jaya Kumar
2
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1
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50
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Mapping Layout for Qubits in Optimization Level = 0
I am currently running a job on a quantum computer. During the transpilation process, I set optimization_level=0 using the command: "tqc = transpile(qc, backend=backend, optimization_level=0)&...
2
votes
1
answer
57
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Grover's Algorithm oracle for finding an 8-bit key
I've been trying around different things with Grover's algorithm, and would want to experiment a practical scenario with it by building an oracle to find an 8-bit key.
Very shortly explained, my ...
0
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0
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50
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How to make a phase oracle that marks the largest number?
I have a list of strategies each with a corresponding score, I want my oracle to apply the phase shift on the strategy with the largest score value. Without knowing the values beforehand how would I ...
0
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0
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36
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Is there a way to get past the AerSimulator's limit of qubits/measurements in Qiskit?
I have run into the AerSimulator's upper limit for qubits/measurements with the circuit I am trying to simulate. The circuit has close to 100 qubits and 100 measurements and is a non-Clifford circuit.
...
1
vote
1
answer
57
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How to display a full operator matrix with Qiskit?
I am running the following code for Qiskit 2.0.2, inside a notebook, to visualize the matrix in a 4-qubits circuit for the CNOT gate:
...
0
votes
1
answer
109
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Qiskit gives different statevectors when performing partial trace
I am building a circuit using Qiskit that contains many computational qubits and several ancilla qubits. Here is a toy example:
...
1
vote
1
answer
92
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Qiskit TwoQubitBasisDecomposer.decomp0 issue
I am having an issue while using the decomp0 method within the TwoQubitBasisDecomposer class. (The issue also occurs with ...
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