T7 Transduction of Quantum Information


Registration Fee per Tutorial:

  • Meeting Attendee (Virtual or In-Person): $140
  • Students: $75
  • Non-meeting Attendee: $150

Who Should Attend?

Graduate students, post-docs, and other scientists interested in learning about the exciting developments in the area of transduction of quantum information. The tutorial talks will be very pedagogical, describing the theoretical foundations and tools of the field, the different modalities of quantum information, and the techniques and platforms for converting between modalities. Latest developments and open questions will also be prominently featured.

Tutorial Description

In recent decades it has become clear that each quantum science platform, from superconducting circuits to atom arrays to cavity quantum electrodynamics (QED), features unique strengths and suffers unique weaknesses. Hybrid quantum science efforts aim to merge disparate platforms and thus benefit from their various strengths whilst mitigating their weaknesses. This tutorial will focus on the central building block of a hybrid quantum system: the transducer that coherently converts quantum information between two underlying platforms. Designing such a transducer exposes a fundamental challenge of quantum science, which is how to achieve strong coupling between individual qubits and a transducing device. We will provide overviews of the various transduction technologies, focusing on connections to the common figures of merit that control performance.


  • Theory: We will focus on formalisms for linear transduction between different quantized modes including acoustic phonons, microwave and optical photons, and spin wave excitations called magnons. We will delve into the challenges of coupling a single device – the transductor – to two disparate quantum modes, and in turn coupling these modes to the qubits operating in quantum processors based on each of these two disparate modalities. We will describe different methods for building hybrid networks that include transducer elements. Finally, we will touch on nonlinear transducers – such as atoms – that could simultaneously process quantum information and transduce it to a different modality.
  • Optomechanics and electro-optomechanics: Strain in nanophotonic cavities can couple acoustic phonons with optical photons. This strain in turn can be coupled to piezo-electric materials that convert between acoustic phonons and microwave photons. The combination of these processes can be used to convert microwave photons to the optical domain, and each of these processes individually can be used to store quantum information in acoustic phonons that can have exquisite coherence times in phononic crystals.
  • Electro-optics: The electro-optic effect describes a change in the optical properties of a material in response to an applied electric field. This platform provides another route to microwave-to-optical transduction when this electric field corresponds to a single microwave or RF photon.
  • Cold atoms and atoms in host crystals: Atoms boast all types of electromagnetic transitions and are thus a natural setting to convert between modalities at the quantum level. We will look at approaches based on isolated, laser cooled atoms as well as atomic impurities in host crystals.


  • Nikolai Lauk, Caltech
  • Jacob P. Covey, University of Illinois at Urbana-Champaign


  • Liang Jiang, University of Chicago
  • Amir Safavi-Naeini, Stanford University
  • Ash Kumar, University of Chicago
  • Nikolai Lauk, Caltech