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Newest 'superconducting-quantum-computing' Questions - Quantum Computing Stack Exchange
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Learn more about TeamsQuestions tagged [superconducting-quantum-computing]
For questions about the superconducting realization of quantum computers. Questions can be about both the implementation of this realization or the theory behind this realization. If you are asking about a specific aspect of superconducting quantum computers, please also tag with that (i.e., if you are also asking about the Josephson junction, tag with that).
115 questions
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0
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0
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12
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Frequency-flux characteristics of an Asymmetrical Transmon qubit
For a tunable transmon qubit with asymmetrical Josephson Junctions, I want to look at the variation of frequency of circuit with magnetic flux bias $\Phi_{ext}$. Given a Hamiltonian:
$$H = 4E_cn^2 - ...
5
votes
2
answers
127
views
Is there any way to mitigate speed limitations of logic gates in neutral atom platforms?
I'm currently studying the neutral-atom quantum platform. One notable drawback I've learned is that its logic gate operations are about x1000 slower than superconducting systems. This issue would ...
3
votes
2
answers
135
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Can QEC Handle Continuous Errors Like Rotation and Dephasing?
"I've recently started learning about Quantum Error Correction (QEC). I notice that many papers focus on discrete errors like bit-flips and phase-flips (Pauli errors), and I understand that ...
2
votes
0
answers
101
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What are textbook about quantum computing for graduate students?
I'm looking for an overview of quantum computing for graduate students. Does anyone know of a textbook that includes topics on surface codes and transmon qubits? Nielsen-Chuang is certainly a bible, ...
2
votes
0
answers
39
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Calculating the Energy Levels of Superconducting Qubits as a Function of Magnetic Flux
I'm trying to recreate the transition frequency versus magnetic flux bias graph from the paper A Quantum Engineer's Guide to Superconducting Qubits using the ...
2
votes
0
answers
67
views
Measuring Coupling Strength in a Tunable Coupler Quantum Processor
I have access to the Ankaa-3 Quantum Processor, which features a tunable coupler scheme where two tunable transmon qubits are interconnected by a symmetric tunable coupler.
I would like to use pulse-...
1
vote
0
answers
36
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Eigenvalues of the Cooper Pair box
THe Hamiltonian of the Cooper pair box is
$$
\hat H = 4 E_C (\hat N - N_g)^2 - E_J\cos\hat \Theta
$$
In number basis it's written as
$$
\hat H = 4 E_C \sum_N |N\rangle (N - N_g)^2 \langle N | - \frac{...
1
vote
1
answer
128
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What happens with qubits which are not measured (readout) in superconducting quantum computer?
The treatment of unused qubits is far from trivial, e.g. Shor requires "to uncompute" them - I wanted to ask what happens with qubits that are not measured in superconducting QC?
If I ...
1
vote
0
answers
64
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How to find the relation between the number of photons in the readout resonator and SNR?
Motivated by this thesis (Sections 3.5-3.6, pp. 70-78), I'd like to find a relation between the number of photons in the readout resonator and SNR.
In considered thesis I found two interpretations of $...
0
votes
2
answers
88
views
How can contantenated codes help qubits be robust to ionizing radiation?
In Quantum error correction below the surface code threshold, it was discovered that correlated errors set a noise floor of $10^{-10}$ for Willow. In Beyond NISQ: The Megaquop Machine, Preskill's ...
1
vote
1
answer
51
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Relationship between coupling strength in cross-resonance gates and coefficients in Hamiltonian tomography?
In the effective Hamiltonian for the cross-resonance (CR) gate, the interaction term is written as:
$$
\tilde{H}_{\rm eff}^{\rm CR} = - \frac{\Delta_{12}}{2}\sigma_1^z
+ \frac{\Omega(t)}{2} \left(\...
4
votes
0
answers
69
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Is gate optimization of superconducting qubits really a reinforcement learning problem?
There has in several scientific articles related to designing gates for superconducting qubits, been proposed to use reinforcement learning to design pulses with high fidelity and short duration.
Some ...
2
votes
1
answer
78
views
Basic questions about google superconducting qubit system model
In this paper about Google superconducting qubit system, I want to understand the origin of equation (1), and the origin of the $\nu/2 Z$ term in equation (2). Regarding the first point, I want to ...
3
votes
0
answers
46
views
Is assumption that it is easier to add qubits to quantum annealer than general quantum computer outdated assumption?
In november 2025 IBM will have quantum computer with about 4 000 qubits. After that it is highly possible that within a few years qubit count will be in a limit of their new architecture that is about ...
1
vote
1
answer
125
views
Implementation of U3 and U1 gate in Qiskit-1.0
How do I implement those two gates in the new version of Qiskit? I have used RY and PhaseShift resp. but I don't know if it's correct or not.
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quantum-gate × 16
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error-correction × 10
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decoherence × 5
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