To address the question about qubit fidelity in D-Wave quantum annealing devices and their calibration methods, we can break down the key points as follows:

Qubit Fidelity in D-Wave Systems

D-Wave's quantum processors (e.g., Advantage, 2000Q) use superconducting flux qubits, optimized for quantum annealing—a specialized paradigm focused on solving optimization problems rather than gener...

Short answer There isn’t a single, meaningful “qubit fidelity” number for a D‑Wave annealer, and randomized benchmarking (a gate‑model tool) does not apply. D‑Wave devices are analog quantum annealers; the relevant question is how faithfully the hardware realizes the programmed Ising Hamiltonian over the whole chip. That faithfulness is characterized by control errors and noise rather than gate fi...

Short answer
• D-Wave does not publish a per-qubit “fidelity” in the sense used for gate-based processors, because quantum annealers do not execute a sequence of unitary gates whose average error can be characterised with protocols such as randomized benchmarking.
• All qubits and couplers are factory- and field-calibrated automatically before the system is made available to users. The outc...

Qubit Fidelity and Calibration in D-Wave Systems

D-Wave quantum annealers use superconducting flux qubits, and you're right that these qubits can't be manufactured identically, leading to variations in performance. Information about individual qubit fidelities isn't readily available on D-Wave's public website, but I can provide some insights on how D-Wave approaches calibration and what metric...

D-Wave's quantum annealing systems indeed face unique challenges when it comes to characterizing qubit fidelity, and you're correct that traditional methods like randomized benchmarking aren't directly applicable. Here's what we know about D-Wave qubit characterization:

Available Calibration Data

While D-Wave doesn't publish comprehensive fidelity metrics like gate-based quantum computers do,...

Excellent question. You've hit on a crucial and often misunderstood aspect of D-Wave's quantum annealers. The short answer is that the concept of "qubit fidelity" as used in gate-based quantum computers doesn't directly translate to quantum annealers, and D-Wave uses a different set of metrics and calibration procedures appropriate for their architecture.

Let's break this down.

1. The Gate-M...

In the gate‐model world one normally talks about single- and two-qubit gate fidelities measured by randomized benchmarking or process‐tomography. In a quantum‐annealer like D-Wave’s machine there are no discrete “gates” to benchmark and you don’t usually talk about a “gate fidelity” per qubit. Instead what matters is how accurately the analog Hamiltonian you program into the machine (the local...

“Qubit fidelity” is a concept that comes from the gate-model world, where one asks “if I try to apply a π-pulse (or a CNOT) how likely am I to get the state I expect?”.
D-Wave processors do not apply gates; they realise an analogue, time-dependent Ising Hamiltonian

H(s)=A(s)∑iσi​x+B(s)⎛⎝∑i hiσi​z+∑i<j> Jijσi​zσj​z⎞⎠ ,   0≤s≤1,

and the question is therefore not “how accurate is a gate?” but

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