Two energy scales are relevant during quantum annealing, **A(s)** and *B(s)*:

**A(s)** represents the transverse, or tunneling, energy.
**B(s)** is the energy applied to the problem Hamiltonian.
**s **is the ratio between the current time during the anneal and the total annealing time and has a value between 0 and 1.

Energy scales **A(s)** and *B(s)* change during the quantum annealing process. In particular, a single, global, time-dependent bias controls the trajectory of **A** and *B*. At any intermediate value of **s**, the ratio **A(s)/B(s)** is fixed. We can choose the trajectory of one of **A** or *B* with time. The standard annealing schedule, **s**, produces a quadratic growth in *B(s)*. Typical values of **A(s)** and *B(s)* are shown in the figure below.

See the D-Wave system documentation for more information on quantum annealing.

The annealing schedule for the current QPU is located here.

### Relevant Links

Introduction to Quantum Annealing

Annealing Energy Functions

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