Metrics update (#364)

Closes #287

---------

Co-authored-by: Fran Cabrera <[email protected]>

cSpell.json

@@ -45,6 +45,7 @@
     "Hamiltonians",
     "Eigensolver",
     "Eigensolvers",
+    "EPLG",
     "Factorizers",
     "exponentials",
     "Hadamard",

docs/run/system-information.mdx

@@ -47,8 +47,10 @@ These values are shown on both the Systems and Simulators tabs of the [Compute r
 
 *   **Name** - The unique name assigned to a specific quantum system or simulator. Backends 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.
-*   **QV** - Quantum volume. This value measures the performance of gate-based quantum computers, regardless of their underlying technology.
-*   **CLOPS** - CLOPS, or circuit layer operations per second, is a measure of how many layers of a QV circuit a QPU (quantum processing unit) can execute per unit of time. Find more information about this metric in the paper called [Quality, Speed, and Scale: three key attributes to measure the performance of near-term quantum computers.](https://arxiv.org/abs/2110.14108)
+*   **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).
+* **CLOPS_h** -- A measure of how many layers of a 100x100 circuit (hardware-aware circuit) a QPU (quantum processing unit) can execute per unit of time.
+*   **QV** - Quantum volume. This value is another metric for system quality based on passing a fidelity threshold for a set of random, square all-to-all connected circuits. Provided as the peak value measured on a system of devices. For details, see the paper [Validating quantum computers using randomized model circuits](https://arxiv.org/abs/1811.12926).
 *   **Status** - The system status.
 *   **Total pending jobs** - The total number of jobs that you have submitted to this system.
 *   **Processor type** - Reflects the system topology and indicates the approximate qubit count.