M. A. Beck

University of Wisconsin–Madison

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R. McDermott

University of Wisconsin–Madison

Ted Thorbeck

IBM (United States)

Joshua Isaacs

University of California System

Joseph Suttle

University of Wisconsin–Madison

F. Schlenker

University of Wisconsin–Madison

B. L. T. Plourde

Syracuse University

Edward Leonard

University of Wisconsin–Madison

Maxim Vavilov

University of Wisconsin–Madison

J. D. Pritchard

University of Strathclyde

M. Saffman

University of Wisconsin–Madison

Cooperative Institutions

University of Wisconsin–Madison

Syracuse University

University of Waterloo

IBM Research - Thomas J. Watson Research Center

University of Maryland, College Park

University of California, Berkeley

University of Strathclyde

Lawrence Berkeley National Laboratory

University of Illinois Urbana-Champaign

University of Wisconsin System

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Measurement of a superconducting qubit with a microwave photon counter

Science (2018)

Alex Opremcak Ivan Pechenezhskiy Caleb Howington Bradley Christensen M. A. Beck

Fast, high-fidelity measurement is a key ingredient for quantum error correction. Conventional approaches to the measurement of superconducting qubits, involving linear amplification of a microwave probe tone followed by heterodyne detection at room temperature, do not scale well to large system sizes. Here we introduce an alternative approach to measurement based on a microwave photon counter. We demonstrate raw single-shot measurement fidelity of 92%. Moreover, we exploit the intrinsic damping of the counter to extract the energy released by the measurement process, allowing repeated high-fidelity quantum non-demolition measurements. Crucially, our scheme provides access to the classical outcome of projective quantum measurement at the millikelvin stage. In a future system, counter-based measurement could form the basis for a scalable quantum-to-classical interface.

High fidelity

10.1126/science.aat4625

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Citations (75)

Optimized coplanar waveguide resonators for a superconductor–atom interface

Applied Physics Letters (2016)

M. A. Beck Joshua Isaacs Donald Booth J. D. Pritchard M. Saffman

We describe the design and characterization of superconducting coplanar waveguide cavities tailored to facilitate strong coupling between superconducting quantum circuits and single trapped Rydberg atoms. For initial superconductor–atom experiments at 4.2 K, we show that resonator quality factors above 104 can be readily achieved. Furthermore, we demonstrate that the incorporation of thick-film copper electrodes at a voltage antinode of the resonator provides a route to enhance the zero-point electric fields of the resonator in a trapping region that is 40 μm above the chip surface, thereby minimizing chip heating from scattered trap light. The combination of high resonator quality factor and strong electric dipole coupling between the resonator and the atom should make it possible to achieve the strong coupling limit of cavity quantum electrodynamics with this system.

Coplanar waveguide

Waveguide

Rydberg atom

Q factor

10.1063/1.4962172

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Citations (15)

Hybrid atom-photon quantum gate in a superconducting microwave resonator

Physical Review A (2014)

J. D. Pritchard Joshua Isaacs M. A. Beck R. McDermott M. Saffman

We propose a novel hybrid quantum gate between an atom and a microwave photon in a superconducting coplanar waveguide cavity by exploiting the strong resonant microwave coupling between adjacent Rydberg states. Using experimentally achievable parameters gate fidelities $> 0.99$ are possible on sub-$\mu$s timescales for waveguide temperatures below 40 mK. This provides a mechanism for generating entanglement between two disparate quantum systems and represents an important step in the creation of a hybrid quantum interface applicable for both quantum simulation and quantum information processing.

Coplanar waveguide

Waveguide

Rydberg atom

Microwave cavity

10.1103/physreva.89.010301

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Citations (65)

Digital Coherent Control of a Superconducting Qubit

Physical Review Applied (2019)

Edward Leonard M. A. Beck JJ Nelson Bradley Christensen Ted Thorbeck

Superconducting qubits are conventionally controlled with shaped microwave pulses from a microwave carrier tone. This works well for small systems, but is difficult to scale up to the millions of qubits needed for a general-purpose quantum computer. Instead, the authors suggest irradiating a qubit with trains of quantized flux pulses derived from single flux quantum (SFQ) digital logic. The pulses are generated by an SFQ driver circuit cofabricated on the qubit chip. This work opens the door to tight integration of a quantum array with a classical coprocessor, to lower wiring heat load, latency, and overall system footprint.

Coherent control

10.1103/physrevapplied.11.014009

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Citations (114)