# September 2020 product updates

- New public API page

Use this page to learn how to use the public REST APIs by reviewing the spec, exploring each API in detail, and working through an example.

- See each qubit's state, at a glance

The phase disk visualization, at the end of each qubit in your IBM Quantum™ Composer circuit, indicates the probability that the qubit is in the`|0>`

state, the phase of the state vector in the complex plane, and the reduced purity of the qubit state.

- See the Quantum Volume of each system

The highest Quantum Volume (QV) recorded for each system is now listed on the Quantum services(opens in a new tab) page.

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