Questions 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).
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What is the logical gate speed of a superconducting quantum computer?
What is the logical gate speed of a photonic quantum computer? says
In a simple world the speed of a photonic quantum computer would just be the speed at which it’s possible to make small (fixed ...
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Why doesn't increasing shots improve results using gate-cutting from Qiskit circuit knitting toolbox?
I am trying to understand the Qiskit Circuit Knitting Toolbox 0.7.2 . I implemented the sample problem for gate cutting in particular. In my understanding if we increase the number of shots the ...
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How to learn about quantum computing and qiskit
I am an undergraduate in Electrical engineering, I have taken one course on quantum mechanics but nothing related to quantum information or algorithms or quantum computing. I looked up some courses ...
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Capacitance matrix of superconducting qubit
I want to start to do some simulation and design of superconducting qubits. I want to start using qiskit metal, but in order to calculate the capacitance matrix I need to interface it with Ansys. ...
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Understanding frequency sweep results on superconducting quantum computers
I have run some frequency sweep experiments on ibm_osaka quantum computer from IBM. The experiment is presented here in detail: https://qiskit.org/textbook/ch-quantum-hardware/calibrating-qubits-pulse....
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Superconducting qubits and temperature
I would like to ask about the need of a low temperature for the operation of superconducting qubits. I know a superconducting qubit is made from basically a LC circuit and Josephson junction. So ...
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How to determine the single-qubit phase?
In some works it is suggested to find the qubit phase by the following method:
Apply $X/2$ (or $Y/2$) gate - preparing the qubit in superposition.
Detune the qubit by flux pulse, for example here ...
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I would like to know the textbook/paper on hamiltonian for rf-SQUID
I am a graduate student in the Department of Computer Engineering, and I am currently doing research on superconducting quantum computers. In particular, I am focusing on quantum annealing machines ...
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Which HEMT (standard transistor) amplifiers are used in superconducting qubit readout chain?
The two images below show HEMT amplifiers at the 3-6K stage. All the papers simply mention "standard HEMT amplifiers", but I am not sure what "standard" means. Does anyone know of ...
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Resources to study superconducting quantum hardware for beginners
I want to start studying quantum hardware, in particular I'm interested on superconducting qubit. Are there any valid resources for a beginner (notes, lecture...)? I'm an electronic engineer and I ...
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Phase accumulation for multiple Rabi driving pulses
When a single-qubit gate is operated by Rabi driving, the resulting operator is equivalent to
$$ \hat{O} = R_z(\omega t) R_x(\Omega t)\tag{1}$$
where $\omega$ is the frequency of the driving field, $\...
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Why superconducting qubits need periodic calibration?
I want to understand in some detail why superconducting qubits need periodic calibration. The usual, hand wavy explanation is environmental effects that tend to vary. However, I suspect that the ...
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In qubit phase tracking, does the phase $\delta$ have to be synchronized to the Larmor precession?
In many textbooks (e.g. LaPierre 2021 or Byrd 2022), when dealing with the physical implementation of quantum gates in spin qubits, Larmor precession is usually introduced first as a way to rotate the ...
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What is the clear definition of coherent versus incoherent errors?
The noise types in quantum computing are pivotal topics frequently discussed in academic papers.
Could you provide a clear definition of coherent versus incoherent errors? Additionally, I'm keen to ...
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What is the optimal hardware for quantum computing, and what factors contribute to its preference?
In conventional computing, the use of CMOS (Complementary Metal Oxide Semiconductor) technology as the foundational circuitry for digital logic gates in CPUs has become the industry norm. CMOS's ...
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