Multiqubit experiments in 3D circuit quantum electrodynamics PDF Download
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Author: Jacob Blumoff
Publisher: Lulu.com
ISBN: 1387178563
Category : Science
Languages : en
Pages : 242
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Book Description
This thesis describes experimental work done in the field of quantum computing with three-dimensional circuit quantum electrodynamics devices.
Author: Jacob Blumoff
Publisher: Lulu.com
ISBN: 1387178563
Category : Science
Languages : en
Pages : 242
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Book Description
This thesis describes experimental work done in the field of quantum computing with three-dimensional circuit quantum electrodynamics devices.
Author: Oliver Viehmann
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Author: Matthew Reed
Publisher: Lulu.com
ISBN: 1304084868
Category : Science
Languages : en
Pages : 384
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Book Description
Softcover version of 2013 Ph.D. thesis of Matthew David Reed presented to the Physics department of Yale University. Concerns the realization of quantum error correction in the circuit quantum electrodynamics architecture, a precursor to quantum computing.
Author: Jean-Luc François-Xavier Orgiazzi
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
This thesis presents circuit quantum electrodynamic (cQED) experiments done with artificial atoms coupled to a high quality factor superconducting microwave resonator. This work discusses the theoretical framework, design, fabrication, implementation and characterization of a multi-qubit system using superconducting persistent current qubits, often referred as flux qubits. We developed a new type of cryogenic aid for fast turnaround microwave experiments. The minimum turnaround time to perform microwave experiments in dilution refrigerators is typically a few days, as required by cooling down and warming up the entire refrigerator. The cryogenic microwave payload and wiring needed for each qubit and resonator add a significant heat load to the system which typically only has a few μW s of cooling power at millikelvin temperatures. We present a new experimental approach we developed in which a suitable sample holder is attached to a cold-insertable probe and brought in contact with transmission lines permanently mounted inside the cryostat. The total turnaround time is reduced to 8 hours if the target temperature is 80 mK. This new measurement method increased our ability to successfully identify good devices with fast design-characterization iterations, while allowing months-long measurements at 30 mK. Our device architecture uses several qubits, each of which is controlled via on-chip fast flux bias lines. Readout of the qubit's quantum state is performed by homodyne detection of the resonator field at large driving power. We observe long coherence times at the optimal bias point of the flux qubits and present decoherence measurements around this optimal point, where the flux qubits couple mostly to magnetic flux noise. Dynamical decoupling techniques employing fast microwave pulses are used to protect the qubit's coherence and allow calculating the magnetic flux noise power spectral density of the qubit's environment. Photon-mediated interaction between distant qubits in the resonator allows the implementation of a two-qubit controlled-NOT gate using the selective darkening technique. This multi-qubit superconducting design is an interesting platform to study the decoherence properties of flux qubits, the properties of strong interaction of electromagnetic radiation with macroscopic quantum systems. These results demonstrate the potential of cQED as a platform for fundamental investigations of decoherence and quantum dynamics of flux qubits.
Author: Elisabeth Christiane Maria Hoffmann
Publisher:
ISBN:
Category :
Languages : en
Pages : 119
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Author: Ravi Kaushik Naik
Publisher:
ISBN: 9780438756472
Category :
Languages : en
Pages : 98
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Book Description
In this thesis, we examine an extension of circuit quantum electrodynamics (QED), cavity QED using superconducting circuits, that utilizes multimode cavities as a resource for quantum information processing. We focus on the issue of qubit connectivity in the processors, with an ideal processor having random access-the ability of arbitrary qubit pairs to interact directly. Here, we implement a random access superconducting quantum information processor, demonstrating universal operations on a nine-qubit memory, with a Josephson junction transmon circuit serving as the central processor. The quantum memory is a multimode cavity, using the eigenmodes of a linear array of coupled superconducting resonators. We selectively stimulate vacuum Rabi oscillations between the transmon and individual eigenmodes through parametric flux modulation of the transmon frequency. Utilizing these oscillations, we perform a universal set of quantum gates on 38 arbitrary pairs of modes and prepare multimode entangled states, all using only two control lines. We thus achieve hardware-efficient random access multi-qubit control. We also explore a novel design for creating long-lived 3D cavity memories compatible with this processor. Dubbed the "quantum flute", this design is monolithic, avoiding the loss suffered by cavities with a seam between multiple parts. We demonstrate the ability to manipulate the spectrum of a multimode cavity and also measure photon lifetimes of 0.5‒1.3 ms for 21 modes. The combination of long-lived quantum memories with random access makes for a promising architecture for quantum computing moving forward.
Author: Stefan Putz
Publisher: Springer
ISBN: 3319664476
Category : Computers
Languages : en
Pages : 136
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Book Description
This thesis combines quantum electrical engineering with electron spin resonance, with an emphasis on unraveling emerging collective spin phenomena. The presented experiments, with first demonstrations of the cavity protection effect, spectral hole burning and bistability in microwave photonics, cover new ground in the field of hybrid quantum systems. The thesis starts at a basic level, explaining the nature of collective effects in great detail. It develops the concept of Dicke states spin-by-spin, and introduces it to circuit quantum electrodynamics (QED), applying it to a strongly coupled hybrid quantum system studied in a broad regime of several different scenarios. It also provides experimental demonstrations including strong coupling, Rabi oscillations, nonlinear dynamics, the cavity protection effect, spectral hole burning, amplitude bistability and spin echo spectroscopy.
Author: Lev Samuel Bishop
Publisher:
ISBN:
Category :
Languages : en
Pages : 314
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Author: Lev Samuel Bishop
Publisher:
ISBN:
Category :
Languages : en
Pages : 382
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Author: David Isaac Schuster
Publisher:
ISBN: 9780549067177
Category :
Languages : en
Pages : 252
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Book Description
This thesis describes the development of circuit quantum electrodynamics (QED), architecture for studying quantum information and quantum optics. In circuit QED a superconducting qubit acting as an artificial atom is electrostatically coupled to a 1D transmission line resonator. The large effective dipole moment of the qubit and high energy density of the resonator allowed this system to reach the strong coupling limit of cavity QED for the first time in a solid-state system. Spectroscopic investigations explore effects of different regimes of cavity QED observing physics such as the vacuum Rabi mode splitting, and the AC Stark effect. These cavity QED effects are used to control and measure the qubit state, while protecting it from radiative decay. The qubit can also be used to measure and control the cavity state, as shown by experiments detecting and generating single photons. This thesis will describe the theoretical framework, implementation, and measurements of the circuit QED system.
