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# System information

IBM Quantum offers both open and premium access to a wide variety of quantum systems. All quantum systems deployed by IBM Quantum are based on superconducting qubit technology, as the control and scalability of this technology pave a clear path to achieving quantum advantage with these systems. You can see the full details of all IBM Quantum systems on the [Compute resources page.](https://quantum.ibm.com/services/resources?tab=systems)
IBM Quantum® offers both open and premium access to a wide variety of quantum systems. All quantum systems deployed by IBM Quantum are based on superconducting qubit technology, as the control and scalability of this technology pave a clear path to achieving quantum advantage with these systems. You can see the full details of all IBM Quantum systems on the [Compute resources page.](https://quantum.ibm.com/services/resources?tab=systems)

Note that the words "system" and "backend" are often used interchangeably.

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## System configuration values

The following is a subset of system configuration values available in IBM Quantum and from [Qiskit](/api/qiskit/qiskit.providers.models.BackendConfiguration).
The following is a subset of system configuration values available in IBM Quantum and from [Qiskit®](/api/qiskit/qiskit.providers.models.BackendConfiguration).

These values are shown on both the Systems and Simulators tabs of the [Compute resources page](https://quantum.ibm.com/services/resources?services=systems) and the details page for each system.

* **Name** - The unique name assigned to a specific quantum system or simulator. Systems hosted on IBM Cloud® have names that begin with `ibmq_*` (older systems) or `ibm_*` (newer systems). All quantum systems are given a city name, e.g., `ibmq_johannesburg`. This name does not indicate where the actual quantum system is hosted. They are named after IBM locations around the world.
* **Name** - The unique name assigned to a specific quantum system or simulator. Systems hosted on IBM Cloud® have names that begin with `ibmq_*` (older systems) or `ibm_*` (newer systems). All quantum systems are given a city name, e.g., `ibmq_johannesburg`. This name does not indicate where the actual quantum system is hosted. They are named after IBM® locations around the world.
* **Qubits** - The number of qubits in a system. For physical quantum systems, this is the number of physical qubits in the device. For simulators, this number need not be uniquely defined, and instead can depend on the simulation method and/or the amount of memory available.
* **EPLG** - Error per layered gate in a chain of 100 qubits. Error per layered gate measures the average gate process error in a layered chain of $N$ qubits ($N$=100 here). It is derived from a similar quantity known as the layer fidelity (LF) where EPLG$_{100}$ = 1-LF$^{\frac{1}{99}}$ and layer fidelity is the process fidelity of the layered chain of $N$ qubits. For details, see the paper [Benchmarking quantum processor performance at scale](https://arxiv.org/abs/2311.05933).
* **CLOPS** - Circuit layer operations per second, and also known as CLOPS_v, is a measure of how many layers of a Quantum volume circuit (virtual circuit) a QPU (quantum processing unit) can execute per unit of time. Find more information about this metric in the paper [Quality, Speed, and Scale: three key attributes to measure the performance of near-term quantum computers](https://arxiv.org/abs/2110.14108).
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