Rachel Noek

High speed, high fidelity detection of an atomic hyperfine qubit

Fast and efficient detection of the qubit state in trapped ion systems is critical for implementing quantum error correction and performing fundamental tests such as a loophole-free Bell test. In this work we present a simple qubit state detection protocol for a (171)Yb+ hyperfine atomic qubit trapped in a microfabricated surface trap, enabled by high collection efficiency of the scattered photons and low background photon count rate. We demonstrate average detection times of 10.5, 28.1, and 99.8 μs, corresponding to state detection fidelities of 99%, 99.856(8)%, and 99.915(7)%, respectively.

Multiscale optics for enhanced light collection from a point source

High-efficiency collection of photons emitted by a point source over a wide field of view (FoV) is crucial for many applications. Multiscale optics offer improved light collection by utilizing small optical components placed close to the optical source, while maintaining a wide FoV provided by conventional imaging optics. In this work, we demonstrate collection efficiency of 26% of photons emitted by a pointlike source using a micromirror fabricated in silicon with no significant decrease in collection efficiency over a 10 mm object space.

Scalable Quantum Information Processing with Trapped Ions

We present a scalable approach to quantum information processing utilizing trapped ions and photons. Ions trapped in microfabricated surface traps provide a practical platform for realizing quantum networks of distributed computing nodes and quantum repeaters.

Long-lived ion qubits in a microfabricated trap for scalable quantum computation

We report state detection, single qubit coherent operations and Raman sideband cooling to near the motional ground state by trapping a single 171Yb+ ion in a surface trap designed and fabricated at Sandia National Laboratories.

Modular Universal Scalable Ion‐trap Quantum Computer (MUSIQC)

We describe a scalable architecture for general‐purpose quantum computation based on trapped ions and photonic interconnect network. The quantum computer is made up of several elementary logic units (ELUs) each containing a modest number of trapped ions representing physical qubits. Each ELU is provided with an optical communication port through which a photon entangled with a communication ion is extracted. Quantum entanglement is distributed between an arbitrary pair of ELUs through a reconfigurable photonic network, which can be utilized to perform two‐qubit quantum logic operation between any pair of physical qubits in the entire quantum computer. We show that this architecture can support universal, fault‐tolerant quantum computation.

Enhanced Light Collection from a Point Fluorescent Source Using Multiscale Optics

We have demonstrated enhancement of point source light collection by a factor of 18 over a traditional f/2.55 imaging system (~17%) across a 15 mm object space by integrating a high numerical aperture micromirror.