Scott Glancy
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View article: Constructing an approximate logical Markovian model of consecutive QEC cycles of a stabilizer code
Constructing an approximate logical Markovian model of consecutive QEC cycles of a stabilizer code Open
As quantum error correction (QEC) experiments continue to make rapid progress, there is increased interest in designing experiments with guarantees of logical performance. At present, one difficulty is the lack of a clear connection betwee…
View article: Broadband pulsed quadrature measurements with calorimeters
Broadband pulsed quadrature measurements with calorimeters Open
A general one-dimensional quantum optical mode is described by a shape in the time or frequency domain. A fundamental problem is to measure a quadrature operator of such a mode. If the shape is narrow in frequency this can be done by pulse…
View article: Scaling and networking a modular photonic quantum computer
Scaling and networking a modular photonic quantum computer Open
Photonics offers a promising platform for quantum computing1-4, owing to the availability of chip integration for mass-manufacturable modules, fibre optics for networking and room-temperature operation of most components. However, experime…
View article: Multi-mode Gaussian State Analysis with one Bounded Photon Counter
Multi-mode Gaussian State Analysis with one Bounded Photon Counter Open
Gaussian states are ubiquitous in quantum optics and information processing, and it is essential to have effective tools for their characterization. One such tool is a photon-number-resolving detector, and the simplest configuration involv…
View article: Optimized experiment design and analysis for fully randomized benchmarking
Optimized experiment design and analysis for fully randomized benchmarking Open
Randomized benchmarking (RB) is a widely used strategy to assess the quality of available quantum gates in a computational context. RB involves applying known random sequences of gates to an initial state and using the statistics of a fina…
View article: An atomic boson sampler
An atomic boson sampler Open
A boson sampler implements a restricted model of quantum computing. It is defined by the ability to sample from the distribution resulting from the interference of identical bosons propagating ac- cording to programmable, non-interacting d…
View article: An atomic boson sampler
An atomic boson sampler Open
A boson sampler implements a restricted model of quantum computing. It is defined by the ability to sample from the distribution resulting from the interference of identical bosons propagating according to programmable, non-interacting dyn…
View article: Multi-mode Gaussian state analysis with total-photon counting
Multi-mode Gaussian state analysis with total-photon counting Open
The continuing improvement in the qualities of photon-number-resolving (PNR) detectors opens new possibilities for measuring quantum states of light. In this work we consider the question of what properties of an arbitrary multi-mode Gauss…
View article: Constraints on Gaussian error channels and measurements for quantum communication
Constraints on Gaussian error channels and measurements for quantum communication Open
Joint Gaussian measurements of two quantum systems are important for quantum communication between remote parties and are often used in continuous-variable teleportation or entanglement-swapping protocols. Many of the errors in real-world …
View article: Multi-mode Gaussian State Analysis with Total Photon Counting
Multi-mode Gaussian State Analysis with Total Photon Counting Open
The continuing improvement in the qualities of photon-number-resolving detectors opens new possibilities for measuring quantum states of light. In this work we consider the question of what properties of an arbitrary multimode Gaussian sta…
View article: TOPICS IN LINEAR OPTICAL QUANTUM COMPUTATION
TOPICS IN LINEAR OPTICAL QUANTUM COMPUTATION Open
This thesis covers several topics in optical quantum computation. A quantum computer is a computational device which is able to manipulate information by performing unitary operations on some physical system whose state can be described as…
View article: Constraints on Gaussian Error Channels and Measurements for Quantum Communication
Constraints on Gaussian Error Channels and Measurements for Quantum Communication Open
Joint Gaussian measurements of two quantum systems can be used for quantum communication between remote parties, as in teleportation or entanglement swapping protocols. Many types of physical error sources throughout a protocol can be mode…
View article: Improving quantum state detection with adaptive sequential observations
Improving quantum state detection with adaptive sequential observations Open
For many quantum systems intended for information processing, one detects the logical state of a qubit by integrating a continuously observed quantity over time. For example, ion and atom qubits are typically measured by driving a cycling …
View article: High-Fidelity Indirect Readout of Trapped-Ion Hyperfine Qubits
High-Fidelity Indirect Readout of Trapped-Ion Hyperfine Qubits Open
We propose and demonstrate a protocol for high-fidelity indirect readout of trapped ion hyperfine qubits, where the state of a $^9\text{Be}^+$ qubit ion is mapped to a $^{25}\text{Mg}^+$ readout ion using laser-driven Raman transitions. By…
View article: Improving quantum state detection with adaptive sequential observations
Improving quantum state detection with adaptive sequential observations Open
For many quantum systems intended for information processing, one detects the logical state of a qubit by integrating a continuously observed quantity over time. For example, ion and atom qubits are typically measured by driving a cycling …
View article: Quadrature Squeezing And Temperature Estimation From The Fock Distribution
Quadrature Squeezing And Temperature Estimation From The Fock Distribution Open
We present a method to estimate the amount of squeezing and temperature of a single-mode Gaussian harmonic oscillator state based on the weighted least squares estimator applied to measured Fock state populations. Squeezing and temperature…
View article: Scalable multiphoton quantum metrology with neither pre- nor post-selected measurements
Scalable multiphoton quantum metrology with neither pre- nor post-selected measurements Open
The quantum statistical fluctuations of electromagnetic fields establish a limit, known as the shot-noise limit, on the sensitivity of optical measurements performed with classical technologies. However, quantum technologies are not constr…
View article: Direct observation of deterministic macroscopic entanglement
Direct observation of deterministic macroscopic entanglement Open
Quantum entanglement goes large Quantum entanglement occurs when two separate entities become strongly linked in a way that cannot be explained by classical physics; it is a powerful resource in quantum communication protocols and advanced…
View article: Multiphoton quantum metrology with neither pre- nor post-selected measurements
Multiphoton quantum metrology with neither pre- nor post-selected measurements Open
The quantum statistical fluctuations of the electromagnetic field establish a limit, known as the shot-noise limit, on the sensitivity of optical measurements performed with classical technologies. However, quantum technologies are not con…
View article: Tomography of Entangled Macroscopic Mechanical Objects
Tomography of Entangled Macroscopic Mechanical Objects Open
Observing quantum mechanics at the macroscopic scale has captured the attention of scientists and the imagination of the public for more than a century. While quantum mechanics was conceived in the context of electrons and atoms, the abili…
View article: Direct observation of deterministic macroscopic entanglement
Direct observation of deterministic macroscopic entanglement Open
Quantum entanglement of mechanical systems emerges when distinct objects move with such a high degree of correlation that they can no longer be described separately. Although quantum mechanics presumably applies to objects of all sizes, di…
View article: Quantum gate teleportation between separated qubits in a trapped-ion processor
Quantum gate teleportation between separated qubits in a trapped-ion processor Open
Teleporting a trapped-ion quantum gate Gating—controlling the state of one qubit conditioned on the state of another—is a key procedure in all quantum information processors. As the scale of quantum processors increases, the qubits will ne…
View article: Joint quantum-state and measurement tomography with incomplete measurements
Joint quantum-state and measurement tomography with incomplete measurements Open
Estimation of quantum states and measurements is crucial for the implementation of quantum information protocols. The standard method for each is quantum tomography. However, quantum tomography suffers from systematic errors caused by impe…
View article: Quadrature histograms in maximum-likelihood quantum state tomography
Quadrature histograms in maximum-likelihood quantum state tomography Open
Quantum state tomography aims to determine the quantum state of a system from measured data and is an essential tool for quantum information science. When dealing with continuous variable quantum states of light, tomography is often done b…
View article: Chained Bell Inequality Experiment with High-Efficiency Measurements
Chained Bell Inequality Experiment with High-Efficiency Measurements Open
We report correlation measurements on two ^{9}Be^{+} ions that violate a chained Bell inequality obeyed by any local-realistic theory. The correlations can be modeled as derived from a mixture of a local-realistic probabilistic distributio…
View article: Experimentally Generated Random Numbers Certified by the Impossibility of Superluminal Signaling
Experimentally Generated Random Numbers Certified by the Impossibility of Superluminal Signaling Open
Random numbers are an important resource for applications such as numerical simulation and secure communication. However, it is difficult to certify whether a physical random number generator is truly unpredictable. Here, we exploit the ph…
View article: Investigating bias in maximum-likelihood quantum-state tomography
Investigating bias in maximum-likelihood quantum-state tomography Open
Maximum-likelihood quantum-state tomography yields estimators that are consistent, provided that the likelihood model is correct, but the maximum-likelihood estimators may have bias for any finite data set. The bias of an estimator is the …
View article: Preparation of Entangled States through Hilbert Space Engineering
Preparation of Entangled States through Hilbert Space Engineering Open
We apply laser fields to trapped atomic ions to constrain the quantum dynamics from a simultaneously applied global microwave field to an initial product state and a target entangled state. This approach comes under what has become known i…