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Scientific publications

The Institute for Quantum Computing (IQC) researchers continue to collaborate and publish their research with the top journals around the world.

The IQC Publications database provides access to scientific literature that has been authored or co-authored by IQC researchers.

Scientific highlights

IQC faculty, postdoctoral fellows and students continue to conduct internationally recognized quantum information science research. Here is a sampling of their cutting-edge research published in academic journals over the past term. 

Creating holograms with neutron beams

OPTICS EXPRESS 24, 20, 22528-22535 (2016)

A team of researchers including Canada Excellence Research Chair in Quantum Information Processing DAVID CORY, research assistant professor DMITRY PUSHIN and PhD student DUSAN SARENAC used neutron beams to create holograms of macroscopic objects for the first time. The results, published in Optics Express, also revealed details about their interiors in ways that ordinary laser light-based visual holograms cannot.

At the Neutron Interferometry and Optics Facility (NIOF) at the National Institute of Standards and Technology (NIST), a neutron entered a single-crystal silicon Mach-Zehnder neutron interferometer. An initial beamsplitter separated the neutron into two paths. The researchers used a spiral phase plate to generate the object beam and a prism to provide the reference beam, which were then reflected at a central beam splitter. A final beamsplitter coherently combined the two beams. One was sent to an imaging detector, the other to an integrating counter that served as an intensity monitor. Given that there was only ever one neutron in the neutron interferometer at a time, the hologram was built up from an incoherent superposition of many events.

New 3-D wiring technique

PHYSICAL REVIEW APPLIED 6, 044010 (2016)

MATTEO MARIANTONI led an international team of researchers in the development of a new extensible wiring technique. The novel technique is capable of controlling superconducting qubits. This is a significant step towards the realization of a scalable quantum computer.

Until recently, the complex infrastructure of accessing qubits inside a cryostat through a network of cables to room-temperature electronics has been a barrier to scaling the quantum computing architecture. This new quantum socket uses three-dimensional wires based on spring-loaded pins to address individual qubits. The architecture is potentially extendable to thousands of qubits. 

IQC and Waterloo researchers who contributed to the paper include JÉRÉMY BÉJANIN, THOMAS McCONKEY, JOHN RINEHART, CAROLYN EARNEST, COREY RAE McRAE, DARYOUSH SHIRI, JAMES BATEMAN and YOUSEF ROHANIZADEGAN. The paper was published in Physical Review Applied, October 18.

NEWS: The prestigious journal Nature featured the work of Mariantoni’s team in their Research Highlights. The feature noted that the structure can interconnect as many as 100 qubits, with the potential to be scaled up to 100,000 in the future.

Strongest coupling between light and matter

NATURE PHYSICS 13, 39-43 (2017)

IQC researchers recorded an interaction between light and matter 10 times larger than previously seen. The paper, Ultrastrong coupling of a single artificial atom to an electromagnetic continuum in the nonperturbative regime, published in Nature Physics in October reports measurements of a range of frequencies broader than the qubit frequency itself.

The researchers controlled the quantum state of a superconducting circuit by using microwave pulses to send photons into the circuit and applying a small magnetic field through a coil inside the dilution refrigerator. By measuring the photon transmission, the researchers could define the resonance of the qubit, indicated by the reflection of the photons off the qubit.

This ultrastrong coupling between photons and qubits may lead to the exploration of new physics related to biological processes, exotic materials such as high-temperature superconductors, and even relativistic physics. IQC researchers contributing to this work include postdoctoral fellow POL FORNDIAZ, PhD students JEAN-LUC ORGIAZZI and MUHAMMET ALI YURTALAN, undergraduate research assistant RON BELYANSKY, and faculty members ADRIAN LUPASCU and CHRISTOPHER WILSON.