Recent years have seen a surge of interest in the machines because of their potential to vastly improve computing power.
They could be used to help develop new materials and medicines or improve aspects of artificial intelligence.
Quantum computers tap into the strange way matter behaves at very small scales.
In classical computers, the unit of information is called a “bit” and can have a value of either one or zero.
But its equivalent in a quantum system – the qubit – can be both one and zero at the same time.
This is the concept of superposition, where something can exist in multiple states at once.
Part of a quantum computer built by Google
To harness their power, multiple qubits must be linked together, a process called entanglement.
And with each additional qubit added, the computational power of the processor is effectively doubled.
The Eagle processor follows the company’s 65-qubit Hummingbird, unveiled in 2020, and the 27-qubit Falcon, in 2019.
“The arrival of the Eagle processor is a major step towards the day when quantum computers can outperform classical computers for useful applications,” senior vice-president and research director Dr Darío Gil said.
“Quantum computing has the power to transform nearly every sector and help us tackle the biggest problems of our time.”
An important step is to demonstrate what has been loosely dubbed “quantum supremacy”.