Jay Gambetta

Today, @IBM and @Cisco announced plans to build a network of large-scale, fault-tolerant quantum computers — a major step toward distributed quantum computing and the foundation for a future quantum internet.

We’re combining IBM’s quantum hardware + software with Cisco’s leadership in networking to tackle the challenge of scaling beyond a single large-scale FTQC. This builds on our commitment to deliver Starling in 2029 and scale to Blue Jay in 2033.

News: ibm.com/quantum/blog/n…

Last week at #QDC25 we unveiled major updates to dynamic circuits — one of the most powerful tools for bringing real-time classical logic directly into quantum execution.

The result: faster mid-circuit measurement, ~600 ns feedforward, parallel conditional ops, better timing control, a new MidCircuitMeasure, and 20× faster circuit prep (400× in CPU time).

We put it to the test on a 46-site kicked Ising simulation across 106 qubits, seeing a 28% reduction in two-qubit gates per Trotter step and up to 24% better performance vs. unitary circuits.

Last week I shared our recent arXiv paper detailing the world’s largest entangled state, with 120 qubits at 56% fidelity with a shot-retention rate of 28%, run on Heron R2 ibm_aachen. Now, with our new Heron R3 ibm_boston, we established a new record GHZ state on 140 qubits at 60% fidelity with a shot-retention rate of 46%.

We just entangled 120 qubits — the largest entangled state ever achieved on a quantum computer.

Read the full letter here: arxiv.org/abs/2510.09520…

A few months ago we shared how our Relay-BP algorithm advanced qLDPC decoding. Now we’ve taken the next step—bringing real-time decoding to hardware. We built an FPGA-based Relay-BP decoder for the gross code that fits on a single AMD VU19P and achieves over 8× faster than GPU-based solutions.

arxiv.org/abs/2510.21600