IBM Fez
Live Status: Currently, the IBM Fez is Online via IBM Quantum Platform (0 jobs). Updated real-time for IBM Quantum circuit monitoring.
QPUStatus is independent. Data from provider APIs may vary from internal states. Trademarks property of IBM Quantum. Not affiliated.
Live Network Load
IBM Quantum Platform
*Metric: Total number of jobs pending execution (Queue Depth) on ibm_fez via IBM Quantum Platform.
Reserved Access
On-Premises
System Availability Trends
Detailed Connectivity (Last 7 Days)
Unofficial Telemetry Dashboard
This is an independent tracking project. QPUStatus is not affiliated with, endorsed by, or partnered with IBM or IBM Quantum. Our data is gathered automatically via public API routing endpoints and may not perfectly reflect internal hardware states. For authoritative information, visit the IBM Quantum Platform.
Hardware Deep Dive
IBM Fez (ibm_fez) was the first IBM quantum system to run the Heron r2 processor, introduced in July 2024. Heron r2 retains the 133-qubit Heron r1 architecture's tunable couplers and heavy-hexagonal layout but expands the qubit count to 156 and introduces a significant new capability: two-level system (TLS) mitigation. Two-level systems are microscopic material defects within the chip substrate and Josephson junction interfaces that can behave as spurious quantum systems, coupling to the computational qubits and reducing their coherence. Heron r2 actively monitors and adjusts the TLS environment, improving coherence stability across the whole chip over time. Together with software upgrades to the Qiskit runtime that introduced parametric compiling and optimised data movement, ibm_fez was the first system capable of accurately executing circuits with up to 5,000 two-qubit gate operations, a milestone IBM had set as its "100x100 challenge" in 2022. IBM reported a benchmark workload that previously took 122 hours on its best 2023 hardware completed in approximately 2.4 hours on ibm_fez, representing roughly a 50-fold speedup.
Technical Specifications
Common Provider Questions
What is TLS mitigation and why does ibm_fez have it when ibm_torino does not?
Two-level systems (TLS) are microscopic material defects in the chip substrate and Josephson junction interfaces that can behave as spurious quantum systems. When a TLS energy level drifts close to a qubit frequency, it couples to that qubit and causes sudden drops in coherence time. On Heron r1 (ibm_torino) this was a known but unmitigated source of noise. Heron r2, first deployed on ibm_fez, introduced an active TLS mitigation scheme: the system continuously monitors the TLS environment and makes calibration adjustments to keep the chip operating away from TLS resonances. IBM's documentation describes this as controlling the TLS environment of the chip to improve coherence and stability across the whole device, which is particularly valuable for long, iterative circuits that benefit from consistent gate fidelity across many repeated executions.
Official Resources
IBM Quantum Platform — Compute Resources
Live queue depth, calibration data, and current error rates for ibm_fez directly from IBM Quantum Platform. Sign-in required.
IBM QDC 2024 Announcement Blog
Official IBM Quantum Developer Conference 2024 writeup detailing the Heron r2 processor, the 5,000 two-qubit gate milestone, TLS mitigation, and CLOPS improvements.
IBM Quantum Processor Types Documentation
Official documentation covering the Heron r2 architecture, revision changelog versus r1, TLS mitigation description, and native gate set.
QPU Information Guide
Explanation of all metrics displayed on the IBM Quantum Platform for each QPU, including CLOPS, EPLG, T1, T2, and readout error definitions.