A long-lived Zeeman trapped-ion qubit

We demonstrate unprecedentedly long lifetimes for electron spin superposition states of a single trapped 40Ca+ ion. For a Ramsey measurement, we achieve a 1/e coherence time of 300(50) ms, while a spin-echo experiment yields a coherence time of 2.1(1) s. The latter corresponds to residual effective...

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Detalles Bibliográficos
Autor principal:	Schmiegelow, Christian Tomás
Publicado:	2016
Materias:	Electrospinning Ions Magnetic fields Magnetic moments Magnetism Quantum computers Samarium Coherence time Electron spins Hyperfine structure Magnetic field fluctuations Magnetic noise Measurement time Quantizing magnetic field Superposition state Trapped ions
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09462171_v122_n10_p_Ruster http://hdl.handle.net/20.500.12110/paper_09462171_v122_n10_p_Ruster
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_09462171_v122_n10_p_Ruster
record_format	dspace
spelling	paper:paper_09462171_v122_n10_p_Ruster2023-06-08T15:53:51Z A long-lived Zeeman trapped-ion qubit Schmiegelow, Christian Tomás Electrospinning Ions Magnetic fields Magnetic moments Magnetism Quantum computers Samarium Coherence time Electron spins Hyperfine structure Magnetic field fluctuations Magnetic noise Measurement time Quantizing magnetic field Superposition state Trapped ions We demonstrate unprecedentedly long lifetimes for electron spin superposition states of a single trapped 40Ca+ ion. For a Ramsey measurement, we achieve a 1/e coherence time of 300(50) ms, while a spin-echo experiment yields a coherence time of 2.1(1) s. The latter corresponds to residual effective rms magnetic field fluctuations ≤2.7×10-12T during a measurement time of about 1500 s. The suppression of decoherence induced by fluctuating magnetic fields is achieved by combining a two-layer μ-metal shield, which reduces external magnetic noise by 20–30 dB for frequencies of 50 Hz–100 kHz, with Sm2Co17 permanent magnets for generating a quantizing magnetic field of 0.37 mT. Our results extend the coherence time of the simple-to-operate trapped-ion spin qubit to ultralong coherence times which so far have been observed only for magnetic insensitive transitions in atomic qubits with hyperfine structure. © 2016, Springer-Verlag Berlin Heidelberg. Fil:Schmiegelow, C.T. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09462171_v122_n10_p_Ruster http://hdl.handle.net/20.500.12110/paper_09462171_v122_n10_p_Ruster
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Electrospinning Ions Magnetic fields Magnetic moments Magnetism Quantum computers Samarium Coherence time Electron spins Hyperfine structure Magnetic field fluctuations Magnetic noise Measurement time Quantizing magnetic field Superposition state Trapped ions
spellingShingle	Electrospinning Ions Magnetic fields Magnetic moments Magnetism Quantum computers Samarium Coherence time Electron spins Hyperfine structure Magnetic field fluctuations Magnetic noise Measurement time Quantizing magnetic field Superposition state Trapped ions Schmiegelow, Christian Tomás A long-lived Zeeman trapped-ion qubit
topic_facet	Electrospinning Ions Magnetic fields Magnetic moments Magnetism Quantum computers Samarium Coherence time Electron spins Hyperfine structure Magnetic field fluctuations Magnetic noise Measurement time Quantizing magnetic field Superposition state Trapped ions
description	We demonstrate unprecedentedly long lifetimes for electron spin superposition states of a single trapped 40Ca+ ion. For a Ramsey measurement, we achieve a 1/e coherence time of 300(50) ms, while a spin-echo experiment yields a coherence time of 2.1(1) s. The latter corresponds to residual effective rms magnetic field fluctuations ≤2.7×10-12T during a measurement time of about 1500 s. The suppression of decoherence induced by fluctuating magnetic fields is achieved by combining a two-layer μ-metal shield, which reduces external magnetic noise by 20–30 dB for frequencies of 50 Hz–100 kHz, with Sm2Co17 permanent magnets for generating a quantizing magnetic field of 0.37 mT. Our results extend the coherence time of the simple-to-operate trapped-ion spin qubit to ultralong coherence times which so far have been observed only for magnetic insensitive transitions in atomic qubits with hyperfine structure. © 2016, Springer-Verlag Berlin Heidelberg.
author	Schmiegelow, Christian Tomás
author_facet	Schmiegelow, Christian Tomás
author_sort	Schmiegelow, Christian Tomás
title	A long-lived Zeeman trapped-ion qubit
title_short	A long-lived Zeeman trapped-ion qubit
title_full	A long-lived Zeeman trapped-ion qubit
title_fullStr	A long-lived Zeeman trapped-ion qubit
title_full_unstemmed	A long-lived Zeeman trapped-ion qubit
title_sort	long-lived zeeman trapped-ion qubit
publishDate	2016
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09462171_v122_n10_p_Ruster http://hdl.handle.net/20.500.12110/paper_09462171_v122_n10_p_Ruster
work_keys_str_mv	AT schmiegelowchristiantomas alonglivedzeemantrappedionqubit AT schmiegelowchristiantomas longlivedzeemantrappedionqubit
_version_	1768542948372250624

A long-lived Zeeman trapped-ion qubit

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