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Physics

Quantum information science

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Displaying 501 - 525 of 1693

Possible hundredfold enhancement in the direct magnetic coupling of a single-atom electron spin to a circuit resonator

January 2, 2019

Author(s)

Bahman Sarabi, Peihao Huang, Neil M. Zimmerman

We report on the challenges and limitations of direct coupling of the magnetic eld from a circuit resonator to an electron spin bound to a donor potential. We propose a device consisting of a lumped-element superconducting resonator and a single donor

Measurement of the radial mode spectrum of photons through a phase-retrieval method

December 14, 2018

Author(s)

Omar S. Magana Loaiza

We propose and demonstrate a simple and easy-to-implement projective-measurement protocol to determine the radial index 𝑝 of a LaguerreGaussian (LG𝑙𝑝) mode. Our method entails converting any specified high-order LG0𝑝 mode into a near-Gaussian distribution

Multi-pulse fitting of transition edge sensor signals from a near-infrared continuous-wave source

December 11, 2018

Author(s)

Thomas Gerrits, Adriana E. Lita, Sae Woo Nam, Jianwei Lee, Lijiong Shen, Alessandro Cere, Christian Kurtsiefer

Transition-edge sensors (TESs) are photon-number resolving calorimetric spectrometers with near unit efficiency. Their recovery time, which is on the order of microseconds, limits the number resolving ability and timing accuracy in high photon-flux

A post-processing-free single-photon random number generator with ultra-low latency.

December 10, 2018

Author(s)

Michael A. Wayne, Joshua C. Bienfang, Zachary H. Levine, Alan L. Migdall

The low-latency requirements of a practical loophole-free Bell test preclude time-consuming post- processing steps that are often used to improve the statistical quality of a physical random number generator (RNG). Here we demonstrate a post-processing

Kinetic Inductance Traveling Wave Amplifiers For Multiplexed Qubit Readout

December 10, 2018

Author(s)

Leonardo Ranzani, K. C. Fong, G. Ribell, Tomas A. Ohki, David P. Pappas, Mustafa Bal, Xian Wu, Robert P. Erickson, Junling Long, Hsiang S. Ku

We describe a kinetic inductance traveling-wave (KIT) amplifier suitable for superconducting quantum information measurements and characterize its wideband scattering and noise properties. We use mechanical microwave switches to calibrate the four

Using silica-fiber coupling to extend superconducting nanowire single-photon detectors into the infrared

November 30, 2018

Author(s)

Paulina S. Kuo

There is growing interest in superconducting nanowire single-photon detectors (SNSPDs) for their high detection efficiency, low noise, and broad wavelength-sensitivity range. Typically, silica fibers are used to deliver light to the detectors inside the

Spin decoherence in a two-qubit CPHASE gate: the critical role of tunneling noise

November 27, 2018

Author(s)

Peihao Huang, Neil M. Zimmerman, Garnett W. Bryant

The rapid progress in the manipulation and detection of semiconductor spin qubits enables the experimental demonstration of a high fidelity two-qubit logic gate, which is necessary for universal quantum computing. Here, we study the decoherence of two

Spin relaxation of a donor electron coupled to interface states

November 16, 2018

Author(s)

Peihao Huang, Garnett W. Bryant

An electron spin qubit in a silicon donor atom is a promising candidate for quantum information processing because of its long coherence time. To be sensed with a single-electron transistor, the donor atom is usually located near an interface, where the

The Complexity and Verification of Quantum Random Circuit Sampling

October 29, 2018

Author(s)

Adam Bouland, William J. Fefferman, Chinmay Nirkhe, Umesh Vazirani

A critical milestone on the path to useful quantum computers is the demonstration of a quantum computation that is prohibitively hard for classical computers -- a task referred to as quantum supremacy. A leading near-term candidate is sampling from the

Recovering quantum gates from few average gate fidelities

October 24, 2018

Author(s)

Yi-Kai Liu, Ingo Roth, Richard Kueng, Shelby Kimmel, David Gross, Jens Eisert, Martin Kliesch

Characterizing quantum processes is a key task in and constitutes a challenge for the development of quantum technologies, especially at the noisy intermediate scale of today's devices. One method for characterizing processes is randomized benchmarking

On the scalability of parametric down-conversion for generating higher-order Fock states

October 18, 2018

Author(s)

Thomas Gerrits, Adriana Lita, Sae Woo Nam, Johannes Tiedau, Tim J. Bartley, Georg Harder, Christine Silberhorn

Spontaneous parametric down-conversion (SPDC) is the most widely-used method to generate higher-order Fock states (n>2). Yet, a consistent performance analysis from fundamental principles is missing. Here we address this problem by analyzing state fidelity

QFlow lite dataset: A machine-learning approach to the charge states in quantum dot experiments

October 17, 2018

Author(s)

Justyna P. Zwolak, Sandesh Kalantre, Xingyao Wu, Stephen Ragole, Jacob M. Taylor

Joint Quantum State and Measurement Tomography with Incomplete Measurements

October 12, 2018

Author(s)

Adam C. Keith, Charles H. Baldwin, Scott C. Glancy, Emanuel H. Knill

Estimation of quantum states and measurements is crucial for the implementation of quantum information protocols. The standard method for each is quantum tomography (QT). However, QT suffers from systematic errors caused by imperfect knowledge of the

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