Fibre-tip microcavities for enhanced ion-photon coupling in scalable quantum information networks
Fibre-tip microcavities for enhanced ion-photon coupling in scalable quantum information networks
Scalable quantum information processing requires efficient coupling between stationary qubits (trapped atoms, ions, NV centres, etc.) via “flying” single-photon qubits. Here we investigate the optimisation and integration of fibre-tip microcavities into radiofrequency ion traps to achieve (i) high-fidelity transfer of ion qubits onto single photons, (ii) low-loss coupling of cavity photons into single-mode optical fibre, and (iii) achieving conditions (i) and (ii) without disturbing the ion trap.
Our cavities are fabricated by laser micro-machining the ends of optical fibres and subsequent coating with a thin dielectric mirror, giving rise to cavity mirrors with a Gaussian profile. These cavities allow for small mode volume and thus large ion-photon coupling fulfilling requirement (i), while simultaneously providing intrinsic coupling to optical fibres, requirement (ii), as long as mode matching between the cavity mode and the fibre mode can be achieved at the cavity mirror. Using a semi-analytical numerical method, we show that Gaussian-shaped mirrors can in fact be used to enhance ion-photon coupling beyond what is possible with more common spherical cavity mirrors.
Ion traps are notoriously sensitive to the presence of dielectric materials such as cavity mirrors near the trap centre, preventing requirement (iii) from being achieved. We performed an extensive numerical study of five different common ion traps to find the optimum configurations for integrating fibre-tip cavities with minimised effects on the trapping potentials. We discuss these results and present simple and effective design rules for realising optimum ion-cavity based quantum networks.
Horak, Peter
520489b5-ccc7-4d29-bb30-c1e36436ea03
Podoliak, Nina
0908b951-00a7-48a5-bc82-631640910b9c
Takahashi, Hiroki
637b5ded-fe36-40f8-950c-2622296a4cfe
Keller, Matthias
d55e5cb9-c8b3-4489-bf2e-1e80fee56a1d
Horak, Peter
520489b5-ccc7-4d29-bb30-c1e36436ea03
Podoliak, Nina
0908b951-00a7-48a5-bc82-631640910b9c
Takahashi, Hiroki
637b5ded-fe36-40f8-950c-2622296a4cfe
Keller, Matthias
d55e5cb9-c8b3-4489-bf2e-1e80fee56a1d
Horak, Peter, Podoliak, Nina, Takahashi, Hiroki and Keller, Matthias
(2016)
Fibre-tip microcavities for enhanced ion-photon coupling in scalable quantum information networks.
Quantum UK 2016 Conference, Birmingham, United Kingdom.
20 - 22 Sep 2016.
Record type:
Conference or Workshop Item
(Paper)
Abstract
Scalable quantum information processing requires efficient coupling between stationary qubits (trapped atoms, ions, NV centres, etc.) via “flying” single-photon qubits. Here we investigate the optimisation and integration of fibre-tip microcavities into radiofrequency ion traps to achieve (i) high-fidelity transfer of ion qubits onto single photons, (ii) low-loss coupling of cavity photons into single-mode optical fibre, and (iii) achieving conditions (i) and (ii) without disturbing the ion trap.
Our cavities are fabricated by laser micro-machining the ends of optical fibres and subsequent coating with a thin dielectric mirror, giving rise to cavity mirrors with a Gaussian profile. These cavities allow for small mode volume and thus large ion-photon coupling fulfilling requirement (i), while simultaneously providing intrinsic coupling to optical fibres, requirement (ii), as long as mode matching between the cavity mode and the fibre mode can be achieved at the cavity mirror. Using a semi-analytical numerical method, we show that Gaussian-shaped mirrors can in fact be used to enhance ion-photon coupling beyond what is possible with more common spherical cavity mirrors.
Ion traps are notoriously sensitive to the presence of dielectric materials such as cavity mirrors near the trap centre, preventing requirement (iii) from being achieved. We performed an extensive numerical study of five different common ion traps to find the optimum configurations for integrating fibre-tip cavities with minimised effects on the trapping potentials. We discuss these results and present simple and effective design rules for realising optimum ion-cavity based quantum networks.
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More information
Submitted date: 18 August 2016
Accepted/In Press date: 9 September 2016
e-pub ahead of print date: 20 September 2016
Additional Information:
Funded by EPSRC: UK Quantum Technology Hub: NQIT - Networked Quantum Information Technologies (EP/M013243/1)
Venue - Dates:
Quantum UK 2016 Conference, Birmingham, United Kingdom, 2016-09-20 - 2016-09-22
Organisations:
Optoelectronics Research Centre, Quantum, Light & Matter Group
Identifiers
Local EPrints ID: 400887
URI: http://eprints.soton.ac.uk/id/eprint/400887
PURE UUID: bd05c304-672e-48ad-89f0-b9ec59625d24
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Date deposited: 30 Sep 2016 12:52
Last modified: 07 Feb 2023 02:52
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Contributors
Author:
Nina Podoliak
Author:
Hiroki Takahashi
Author:
Matthias Keller
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