Quantum Computing Stack Exchange
Quantum Computing Stack Exchange

Questions tagged [hardware]

38 questions
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How are quantum circuits run on real quantum computers?

Sorry if this question sounds trivial, however I'm struggling to get the intuition of how quantum circuits are actually run on real quantum hardware. As far as I know, in a simulated environment, circuits are transpiled, compiled and assembled so…
mpro
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Is 216 qumodes photonic quantum processor equivalent to 216 qubits superconducting quantum processor, in terms of computational power?

Xanadu just launched borealis, 216 qumodes photonic quantum computer, this week. https://xanadu.ai/blog/beating-classical-computers-with-Borealis Its number of qubits is very interesting because it has twice the number of qubits of IBM Quantum…
Natchapol Patamawisut
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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 have some knowledge of quantum mechanics and quantum…
Simona99
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QPU vs. Solvers

I am trying to understand the roles of the QPU and the solvers in a quantum device, specifically I am reading for this purpose the documentation of D-Wave. While it is clear to me that the QPU of a quantum device could be defined as the quantum chip…
Laura
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3 answers

What are quantum computers actually doing today?

I am curious about what are quantum computers actually doing today. I seem to only be able to find information online about what they could be used for in the future (i.e. breaking encryption, quantum annealing, simulations, etc.). However, it seems…
Horus
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How difficult would initializing spin qubits at room temperature be?

I am researching the Australian company, Archer Material's, room temperature quantum computing chip development. They are pursuing ESR quantum computing at room temperature using carbon nanospheres for the qubit. Below is a paper on their qubit as…
user2521987
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Recent hardware advances towards fault-tolerant quantum computing and quantum error correction

Please excuse the broad nature of the question. I am interested in understanding recent developments by various hardware companies and their approaches towards quantum error correction. My knowledge right now is fragmented and I see a lot of…
user1936752
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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 know how one can derive to obtain this equation.…
karavan
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Qiskit runtime error on hardware but not on simulator

I am trying to run a circuit on hardware. But I get the following error, which is not really helpful tbh. TypeError: unsupported operand type(s) for -: 'NoneType' and 'int It is unclear how to debug this as it only happens on hardware. The circuit…
Dikke Harrie
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Is the choice of Measurement-based model specific to the hardware technology?

Most photonic hardware providers seem to prefer Measurement-based quantum computing (MBQC) over the gate-based model. Is this due to some limitations of the corresponding hardware technologie? If yes, for which other hardware technologies, is this…
26118in
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Classical electronics controls from both sides - could we do it for some quantum electronics?

In classical electronics we actively pull and push electrons by electric field - could we get such two-way control for some quantum electronics? For example silicon quantum dots - for state preparation they use impulse of electric field to tunnel…
Jarek Duda
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Does "detecting and characterizing quantum information [electron spin quantum states]" satisfy statement 5 of DiVincenzo's criteria?

I am reading a company's (Archer Materials) press release on their progress towards building a quantum computing chip and I have a question about how a certain statements are phrased: Archer’s 12CQ chip is a world-first qubit processor technology…
user2521987
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Expectation Value of Observable from evolved statevectors using qiskit on Hardware

I want to compute this - for an entangled n-qubit initial state under the application of a general XY Hamiltonian for a range of time 0 to T. This is to be done to study how the correlations between the qubits decay over time. This…
CuriousMind
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How to run Shor's algorithm on real quantum hardware with Qiskit?

I am trying to factor 15 with Shor's algorithm and want to find the period for $a^x$ mod $15$ on real quantum hardware with Qiskit. I took the code from the Qiskit Textbook and managed to run it on the Aer simulator which gave me the expected…
quantum_interested
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Performance of quantum annealing systems vs gate based ones

Quantum annealers like D-Wave can be used to solve Quadratic Unconstrained Binary Optimization (QUBO) which is a NP Hard problem (see here) while gate based quantum computers, like the ones created by IBM and Google, solve problems in BQP…
antony paul
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