IBM links quantum chips with 'quantum channels' at 99% fidelity

IBM has connected two 120-qubit superconducting chips using four quantum channels — 31.5-inch superconducting cables — with an average transfer fidelity of 99%. The links survived three warm-up and cool-down cycles and transmitted entanglement between the chips.

• Two 120-qubit chips linked by four l-couplers
• Average transfer fidelity of 99%, cables 31.5 inches long
• Channels survived three warm-up and cool-down cycles
• Approach works with Quantum Nighthawk and Starling (2029)