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Journal of Russian Laser Research

Correlated states of a quantum oscillator and of a quantum chain of oscillators with a ? bump in frequency

V. V. Dodonov, Vladimir I. Man’ko, Olga V. Man’ko

Published Jan 1, 1992• 10 citations
Publisher
DOI
10.1007/bf01121108

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Perturbation-induced quantum scarring is a recently discovered phenomenonin a quantum well perturbed by local potential bumps.In this phenomenon,the probability density of an eigenstate in a perturbed system is enhanced along a periodic orbit of the unperturbed classical counterpart. In this Thesis, we examine perturbation-induced scarring in a two-dimensional anisotropic (elliptic) oscillator characterized by the anisotropy parameter, i.e., the frequency ratio of the confining potential. In particular, we show that some eigenstates of the perturbed oscillator are scarred by the so-called Lissajous orbits occurring at specific anisotropy parameters. Furthermore, the stability of these Lissajous scars is preliminarily analyzed.

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Laser phase noise is one of the limiting factors that dictate gate fidelities and coherence times in trapped-ion quantum systems. Previous studies have reported that when the Rabi frequency of an ion qubit is close to the servo-bump phase-noise frequency, the driving laser limits the fidelity and coherence time. This issue has typically been mitigated by choosing a Rabi frequency outside the servo-bump region. However, this constrains the usable range of gate speeds and can limit the achievable fidelity. To address this issue, we developed an active phase-noise stabilization system for a barium-ion optical-qubit laser at 1762 nm, employing a fiber electro-optic modulator (EOM) with an electrical feedforward servo. Our results demonstrate that this setup, based on the Pound-Drever-Hall (PDH) feedforward method, can suppress servo-bump phase noise by 15 dB near the bump peak frequency in our locking system. The laser phase noise is analyzed using delayed self-heterodyne interferometry (DSHI). We further tested the stabilized laser on an optical qubit and observed a clear improvement in coherence time based on the measured amplitude decay of Rabi oscillations, even when the Rabi frequency lies within the servo-bump bandwidth. This technique can be readily adapted to other optical qubits with minimal modifications.
Abstract We developed fabrication and bonding technology of superconductive bump for massive quantum computing. A bonded test vehicle demonstrates supercurrent through 90 000 series daisy-chain. Proposed bump consists of lead-indium alloy. The bumps land onto gold pad on the opposite chip and alloy with the gold pad for supercurrent. The primary advantage of the proposed bump is the minimized damage to the quantum chip. Plasma cleaning process which may degrade sensitive components is only required for bump chips and not for quantum chips. Lower bonding temperature of 100 degrees Celsius for the proposed bump also keeps sensitive components away from degradation in high temperature.
Perturbation-induced quantum scarring is a recently discovered phenomenonin a quantum well perturbed by local potential bumps.In this phenomenon,the probability density of an eigenstate in a perturbed system is enhanced along a periodic orbit of the unperturbed classical counterpart. In this Thesis, we examine perturbation-induced scarring in a two-dimensional anisotropic (elliptic) oscillator characterized by the anisotropy parameter, i.e., the frequency ratio of the confining potential. In particular, we show that some eigenstates of the perturbed oscillator are scarred by the so-called Lissajous orbits occurring at specific anisotropy parameters. Furthermore, the stability of these Lissajous scars is preliminarily analyzed.