Seattle Quantum Computing Meetup

Join us on the Eastside to discuss the latest in Quantum Computing and/or the Qiskit Fall Fest 2026.

We look forward to seeing you there!

Register Here to get the link from BNL: https://www.bnl.gov/quantumcenter/news.php

## "A 1 km photonic link connecting SC circuits in two dilution refrigerators"

#### Presented by Hong Tang, Yale University

Thursday, October 15, 2026, 12:00 pm —
Videoconference / Virtual Event
(see link above to register with BNL to get the zoom link)

Superconducting quantum processors are a leading platform for implementing practical quantum computation algorithms. Although superconducting quantum processors with hundreds of qubits have been demonstrated, their further scale-up is constrained by the physical size and cooling power of dilution refrigerators. This constraint can be overcome by constructing a quantum network to interconnect qubits hosted in different refrigerators, which requires microwave-to-optical transducers to enable low-loss signal transmission over long distances. Although various designs and demonstrations have achieved high-efficiency and low-added-noise transducers, a coherent photonic link between separate refrigerators has not yet been realized. Here we experimentally demonstrate coherent signal transfer between two superconducting circuits housed in separate dilution refrigerators, enabled by a pair of frequency-matched aluminum nitride electro-optic transducers connected via a 1-km telecom optical fiber. The optical frequency matching between two transducers is realized by an asymmetric photonic molecule design, and an overall 80 dB improvement in transduction efficiency over commercial electro-optic modulators is achieved, paving the way towards a fully quantum-enabled link. This work provides critical design guidelines for scalable superconducting quantum networks interconnected by photonic links.

Starts at 12:00 p.m. ET/9:00 a.m. PT.

Hosted by: Kai-Mei Fu - C2QA Deputy Director, University of Washington

IBM Quantum received 4000+ applications to host a Qiskit Fall Fest.
They chose 200, and the Seattle Quantum Computing Meetup was one of them, for the 3rd year in a row!

Join us for a presentation from IBM Quantum !

**The time for this live talk is not yet confirmed. Keep an eye out. **

Speaker: Alex Choquette
Global Strategic Research Development, IBM Quantum
Developing quantum algorithm research ecosystems for IBM Quantum worldwide with a focus on strategic geographies.