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Quantum Computing

Questions tagged [superconducting-quantum-computing]

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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).

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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 - ...
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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 ...
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180views

"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 ...
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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, ...
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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 ...
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83views

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-...
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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{...
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151views

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 ...
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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 $...
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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 ...
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1answer
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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(\...
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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 ...
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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 ...
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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 ...
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148views

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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