All Questions
Tagged with ibm-q-experience ibm-q-experience or
675 questions
3
votes
1
answer
312
views
Consistent QISkit error: "All devices are currently unavailable"
I am attempting to run the following on a remote backend through QISkit:
...
- 183
3
votes
1
answer
426
views
Why can't you run a teleportation circuit on an IBM Q device?
I'm studying teleportation circuits with this tutorial and just out of curiosity, why can't a teleportation circuit be run on an IBM Q device?
- 775
3
votes
1
answer
298
views
Why does Grover's algorithm behaves so different for different solution addresses?
Attached please find two circuits for the IBM quantum composer, that show the outcome of Grover's algorithm with 3 QuBits after 2 iterations for the situation, where the solution is at address 111 and ...
3
votes
2
answers
148
views
Why is rz gate error not exactly zero in IBMQ washington device?
I am looking at the calibration data for IBMQ's washington device (which is published daily) and am finding non-zero values for the field "rz_gate_error_value".
I used to think that RZ gates ...
- 197
3
votes
1
answer
178
views
How to extract per shots measurement result from ionq device using qiskit_braket_provider?
I'm running a circuit on ionq device using qiskit_braket_provider. I want to extract per shot measurement results. While running ...
- 63
3
votes
1
answer
583
views
How can I know the number of qubits used in a job in qiskit?
How can I know the number of qubits used in a job in qiskit?
I can always do something like
...
- 641
3
votes
1
answer
718
views
How can I write if conditions on quantum registers using qiskit
There is a quantum register measured to state $\left|00\right> $ How can i write a code to check weather the first qubit in measured state is 1 or zero and if 1 do some operations or if 0 do other ...
- 51
3
votes
1
answer
380
views
Performance metrics in QSVM
I have implemented QSVM on breast cancer dataset using link: "https://qiskit.org/documentation/stable/0.24/tutorials/machine_learning/01_qsvm_classification.html" but unable to compute other ...
- 317
3
votes
1
answer
420
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Question about mock backends!
I recently learned about the mock backends or the fake backends provided by Qiskit and I was wondering, do they behave the same way IBMQ systems backends like (ibmq_brooklyn)? also, can I depend on ...
- 193
3
votes
1
answer
1k
views
How can I get IBM's API token?
I need an API token to use IBM's real hardware(greater than 5 qubits) in Qiskit, where can I find the price?
- 31
3
votes
1
answer
370
views
IF statement in OpenQASM2.0 on IBM Quantum Experience -- error
I have written the following toy .qasm file, which has some adaptive measurements:
...
- 166
3
votes
2
answers
172
views
Data embedding using IBM quantum composer
How do you use the IBM quantum composer to encode some data $(a,b,c,d)$ represented by a vector ket in which $a,b,c,d$ have been normalized to one? $a|00\rangle + b|01\rangle + c|10\rangle + d|11\...
- 51
3
votes
1
answer
215
views
Why does running my circuit on Quantum Hardware produce such unexpected results?
I am using Jupyter Notebook with Qiskit.
I have created a program that can add two 3-bit numbers together. When I simulate this program on a qasm_simulator it works as expected and I can add any two 3-...
- 107
3
votes
1
answer
392
views
IBMQ: Can I implement a quantum measurement in the middle of a quantum circuit?
I am executing a quantum circuit on an IBM quantum device. The circuit is simple:
A single qubit (start from $|0\rangle$),
Rx($\pi/2$)
Measure (in z)
3 .Rx($-\pi/2$)
Measure (in z)
The final ...
- 33
3
votes
1
answer
75
views
Gate characteristics of different platforms
I would like to know if there is a place in which is summarized the gate characteristics of the different quantum computer existing (IBM,Google, others).
For instance, which kind of two qubit gate ...
- 1,962
3
votes
1
answer
711
views
IF statement in OpenQASM on IBM Quantum Experience
This is a simple circuit introduced in Moran's book "Mastering Quantum Computing with IBM QX" to demonstrate how if works in OpenQASM:
...
- 301
3
votes
2
answers
2k
views
How to perform a time evolution of a quantum state with Qiskit Aqua?
How can we perform a time evolution of a quantum state for a given Hamiltonian with qiskit Aqua operator flow? I'm interested in it due to its higher efficiency.
- 878
3
votes
1
answer
218
views
How do IBM, D-Wave, etc. change phase physically?
How do IBM, D-Wave, etc. change phase physically? In real hardware?
- 313
3
votes
1
answer
523
views
Cannot replicate results in article on pricing financial derivatives on IBM Q
I am trying to implement a circuit for searching for the largest eigenvalue and respective eigenvector of an operator, i.e. phase estimation, introduced in article Towards Pricing Financial ...
- 14.9k
3
votes
1
answer
178
views
How to put a quantum computer on the cloud?
What are the infrastructures needed to build a cloud quantum computing service like IBM Q Experience?
It seems this is not a trivial task. IQX has been running for more than 3 years and yet it is ...
- 692
3
votes
1
answer
327
views
Is IBM Q composer using little-endian representation for multi-qubit states?
I am still confused when I am trying to use the IBM Q composer to reproduce some quantum circuits I found in different papers, and I am wondering if it is because there are two ways to represent a ...
- 91
3
votes
1
answer
2k
views
How do I interpret the readout error for a quantum computer?
For example, the ibmqx2 computer has the most recent readout error of $4.40 \cdot 10^{-2}$. Does this mean per 1000 measurements, 44 faulty results exist?
- 183
3
votes
1
answer
96
views
Bug in IBM backend?
I was trying to see what IBM would do under the hood with a CCNOT gate. Something appears to be erroneous with the run.
The circuit above should produce state 11100 with 100% probability, as ...
- 589
3
votes
1
answer
815
views
Implementing Deutsch's problem on IBM Q composer
I tried to implement the Deutsch's problem on IBM Q but didn't get the results as expected.
So here is the circuit for the Deutsch algorithm
and this is my implementation on the composer:
so let me ...
- 131
3
votes
1
answer
149
views
How much variation is there in the results between each quantum computer on the IBMQ Quantum Experience system?
For example, if you ran the same program on the 'ibmqx2' and 'ibmqx4' computers, how much variance would there be between the results from both systems? There is the inherent presence of noise in each ...
- 183
3
votes
1
answer
121
views
Simulation files for noisy quantum circuits
For our study with Yosi Rinott and Tomer Shoham we need the following simple data:
Starting with a quantum circuit $C$ on $n$ qubits we need two files:
a) A file of probabilities (or amplitudes) for ...
- 201
3
votes
2
answers
260
views
IBM Quantum Experiment CNOT
I have a beginner question regarding CNOT-Gates on IBM Quantum.
Assuming the following simple circuit:
...
- 151
3
votes
1
answer
113
views
What's the difference between depth and num_tensor_factor in qiskit
Now I'm studying about the quantum circuit in qiskit developed by IBM.
The quantum circuit have a several method in itself like depth() and num_tensor_factor().
I don't know what is different between ...
3
votes
2
answers
793
views
'Internal error. Error code 9999' when running job on IBMQ
I'm trying to run a series of circuits in a job and I keep getting this error message which I haven't been able to find the meaning of anywhere in qiskit's documentation, online, etc. The job appears ...
3
votes
1
answer
296
views
How to find the expectation value of several circuits using Qiskit aqua operator logic?
I am using the method from this SE answer to calculate the expectation value using qiskit aqua operator logic which works well for a single circuit. Here is a simplified code snippet to demonstrate ...
- 565
3
votes
1
answer
218
views
What is the relationship between the (sx) error rate listed in calibration and the angle/amplitude errors calculated using the fitter?
The IBM Quantum services website lists calibration statistics for their devices, including the (sx) error rate per qubit, which is listed as a single number. One can also manually calibrate a device ...
3
votes
2
answers
609
views
How to run VQE experiments on IBMQ Backends?
The VQE.run method only takes a quantum_instance of type QuantumInstance or BaseBackend and ...
- 431
3
votes
1
answer
300
views
How can I find the fidelity of the preparation operation $|0\rangle$ of IBMQ?
I want to know the fidelity (or error rate) of the preparation of $|0\rangle$. How can I obtain it?
- 31
3
votes
1
answer
159
views
How call from IBM Q Experience (Jupyter Notebook) cplex
I have the latest version of cplex (12.9) installed on my computer. I use it very well with Jupyter notebook, but in IBM Q Experience, I did not get way to call it. IBM Q Experience warns me that the ...
3
votes
1
answer
636
views
2-qubit QFT in IBMQ: controlled phase rotation
I've started getting into quantum computing in the last few days.
As part of the learning, I've figured it would be fun to implement some circuits on IBMQ Experience as I learn. So now I'm stuck with ...
- 41
3
votes
1
answer
1k
views
Qiskit: 'per shot' result
Is there a way to access the results of measurements 'per shot' performed on a backend such as one of the real IBM machines?
I know it can generate a histogram from the cumulative data, but I was ...
- 33
3
votes
1
answer
244
views
How to re-execute failed jobs in qiskit?
When executing a batch of circuits using the IBMQJobManager and attempting to combine all the results of all jobs with combine_results I get the ...
- 431
3
votes
1
answer
382
views
VQE jobs do not appear in queue
I am trying to calculate the ground state energy of some simple molecules using 'MolecularGroundStateEnergy' tools in qiskit. When I run the calculations for very small molecules (e.g. H2, HeH+) the ...
- 57
3
votes
0
answers
46
views
How many cores and what processors are used in the cloud ibmq_qasm_simulator?
Cloud IBMQ simulator ibmq_qasm_simulator can process up to 32-qubit circuits quite fast. However, I could not find any information about the simulator backend properties, e.g. how many cores, what ...
- 31
3
votes
0
answers
183
views
Difficulty in implementing Grover's Algorithm with large number of qubits
It seems IBM offers a 15 qubit quantum computer through their quantum experience program. However, upon a quick search through the literature, the largest implementation of Grover's algorithm I have ...
- 131
3
votes
0
answers
47
views
Bug report bug report? [duplicate]
The full user guide here states "If you find any bugs, please report them with our bug tracker, accessible via the little bug icon in the lower right-hand corner of each page."
However, I was unable ...
- 141
3
votes
0
answers
649
views
How to measure a Bell inequality violation in IBM Q?
Note: Cross-posted on Physics SE.
I made some circuit to prepare a 2 qubit state, but I am having trouble understanding how to measure Bell's inequality. I know the inequality is of the form
$$|E(a,...
- 313
3
votes
0
answers
672
views
Qiskit Python program cannot connect to QE API
I am just getting started with Qiskit and IBM Quantum Experience, so please forgive my newby question.
I have a IBM Quantum Experience account and I generated an API token.
I used the generated ...
- 333
2
votes
2
answers
393
views
Does IBM have a publicly available tutorial on applied quantum computing and how does one use it? Any Reviews of the Tutorial?
I found this link and I am wondering if anyone has used it to learn or develop applications? I would like to know if people find it worth the time. I am reading the material by the way.
https://...
- 21
2
votes
2
answers
640
views
Why IBM Quantum Experience is giving different results under ibmq_qasm_simulator and ibmq_16_melbourne?
I am trying to run following 6 qubit quantum circuit and I am getting different results under ibmq_qasm_simulator and ibmq_16_melbourne (both involving 8192 shots). What is the reason?
...
- 451
2
votes
1
answer
2k
views
How to run the Qiskit Aer simulator without noise?
I know that the Qasm Simulator execute quantum circuits with presence of noise, even if I do not specify the model of noise in options for that backend.
But how can I execute the circuits without ...
- 918
2
votes
2
answers
467
views
IBM Quantum: Are ibmq_5_yorktown and ibmqx2 different devices?
When I run provider.backends(), ibmqx2 is listed as an available backend, but is not listed on the IBMQ systems page. This file ...
- 147
2
votes
3
answers
344
views
Quantum computing coding setup for a beginner
I want to dive into Quantum computing but I don’t have a personal computer for coding. I have an iPad and I know some quantum computing basics. I had earlier used IBM quantum experience (IBM’s cloud ...
- 29
2
votes
3
answers
391
views
Is it possible to see the probabilities values of qubit ( alpha and beta) while measuring on IBM Quantum experience?
Is it possible to see what are the values of $\alpha$ (probability of being in state zero) and $\beta$ (probability of being in state one) while running on IBM Quantum simulator (we can call it state ...
- 55
2
votes
1
answer
438
views
IBM Q calibration parameters
If I download calibration of a quantum processor on IBM Q website I see these parameters:
T1
T2
frequency (GHz)
readout error
single qubit U2 error rate
CNOT error rate
T1 and T2 are relaxation and ...
- 14.9k