Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Atomic quantum memory: cavity vs single pass schemes

Aurélien Dantan, Alberto Bramati, M. Pinard

Published Oct 15, 2004• 0 citations
OpenAlex

Abstract

This paper presents a quantum mechanical treatment for both atomic and field fluctuations of an atomic ensemble interacting with propagating fields, either in Electromagnetically Induced Transparency or in a Raman situation. The atomic spin noise spectra and the outgoing field spectra are calculated in both situations. For suitable parameters both EIT and Raman schemes efficiently preserve the quantum state of the incident probe field in the transfer process with the atoms, although a single pass scheme is shown to be intrinsically less efficient than a cavity scheme.

Related papers

Atomic quantum memory: Cavity versus single-pass schemes

Aurélien Dantan, Alberto Bramati, M. Pinard

We present a quantum mechanical treatment for both atomic and field fluctuations of an atomic ensemble interacting with propagating fields, either in electromagnetically induced transparency (EIT) or in a Raman situation. The atomic spin noise spectra and the outgoing field spectra are calculated in both situations. For suitable parameters both EIT and Raman schemes efficiently preserve the quantum state of the incident probe field in the transfer process with the atoms, although a single-pass scheme is shown to be intrinsically less efficient than a cavity scheme.

arXiv:quant-ph/0410125•Physical Review A•Apr 4, 2005•66 citations

Quantum-state transfer between fields and atoms in electromagnetically induced transparency

Aurélien Dantan, M. Pinard

We show that a quasiperfect quantum-state transfer between an atomic ensemble and fields in an optical cavity can be achieved in electromagnetically induced transparency (EIT). A squeezed vacuum field state can be mapped onto the long-lived atomic spin associated to the ground-state sublevels of the $\ensuremath{\Lambda}$-type atoms considered. The EIT on-resonance situation show interesting similarities with the Raman off-resonant configuration. We then show how to transfer the atomic squeezing back to the field exiting the cavity, thus realizing a quantum memory--type operation.

arXiv:quant-ph/0312189•Physical Review A•Apr 9, 2004•111 citations

A continuous-variable quantum memory for light

Aurélien Dantan, J. Cviklinski, J. Ortalo +2 more

We study here a different scheme involving a large ensemble of Lambda-type atoms, a control field, and the field to be stored and show how to transfer with a nearly 100% efficiency a quantum state of light (squeezed vacuum) into the ground state coherence of a spin-polarized atomic cloud. We find the best transfer conditions between the two oscillators. The quantum states are well conserved in two seemingly different situations: in the so-called electromagnetically-induced-transparency (EIT) situation (on one-and two-photon resonance) and in a Raman configuration (on two-photon resonance, but for large one-photon detunings). If both situations share interesting similarities in terms of transfer efficiency, and noise spectra, the physical effects responsible for the ideal mapping are quite different, and make the use of both room-temperature and cold atoms possible.

Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)•Jun 1, 2007•0 citations

Quantum state transfer between field and atoms in Electromagnetically Induced Transparency

Aurélien Dantan, M. Pinard

We show that a quasi-perfect quantum state transfer between anatomic ensemble and fields in an optical cavity can be achieved inElectromagnetically Induced Transparency (EIT). A squeezedvacuum field state can be mapped onto the long-lived atomic spinassociated to the ground state sublevels of the Lambda-typeatoms considered. The EIT on-resonance situation show interesting similaritieswith the Raman off-resonant configuration. We then show how totransfer the atomic squeezing back to the field exiting the cavity,thus realizing a quantum memory-type operation.

•Dec 23, 2003•0 citations

Atom-Field QuantumState Manipulation andStorage

Aurélien Dantan, Alberto Bramati, Nicolas Treps

We present various schemes tomanipulate andstore quantumoptical fields into atomic ensembles andshowhowtorealize quantummemoryoperations, entangle atomic ensembles or teleport anatomic ensemble quantum state withhighefficiency. A major challenge inquantum information andcommunication lies intheability tomanipulate andstore quantum states ondemand. Quantum networks consisting ofatomic ensemble nodes connected bylight represent apromising, wayto achieve robust quantum communication. Because ofthelonglifetime oftheir ground state spin, atomic ensembles are goodcandidates tostore thequantum state ofoptical light fields. Wepropose ascheme toachieve quasi-perfect atom-field quantum state transfers inon-resonance Electromagnetically Induced Transparency (EIT) oroff-resonant Ramanconfigurations (11. Weshowthat dissipation isnegligible forsuch interactions, sothat thequantum states arepreserved during transfer operations. Wefirst showhowtomapabroadband squeezed vacuumontotheatomic ground state coherence ofaspin-polarized ensembles. Wefind theoptimal conditions forhighefficiency transfer andpresent amethod toreadout theatomic state inorder toperform aquantum memoryoperation (11. Wealso compare cavity andsingle passschemes; eventhough a cavity interaction turns outtobemoreefficient, single passinteraction should allow forverygoodquality transfer for realistic experimental parameters. We thenpropose toentangle twomacroscopic atomic ensembles using apairofEPR-correlated incident fields. Entanglement isalsoshowntobeconserved during on-resonant oroff-resonant interactions, andcanbestored fora longtimeintwospatially separated ensembles (2). Theatomic entanglement canthenbereadout intheoptical fields exiting thecavities.

•Jan 1, 2005•0 citations

Atomic-ensemble-based quantum memory for sideband modulations

J. Ortalo, J. Cviklinski, Pietro Lombardi +4 more

Interaction of a control and a signal field with an ensemble of three-level atoms allows direct mapping of the quantum state of the signal field into long lived coherences of an atomic ground state. For a vapor of cesium atoms, using Electromagnetically Induced Transparency (EIT) and Zeeman coherences, we compare the case where a tunable single-sideband is stored independently of the other one to the case where the two symmetrical sidebands are stored using the same transparency window. We study the conditions in which simultaneous storage of two non-commuting variables carried by light and subsequent read-out is possible. We show that excess noise associated with spontaneous emission and spin relaxation is small, and we evaluate the quantum performance of our memory by measuring the signal transfer coefficient T and the conditional variance V and using the T-V criterion as a state independent benchmark.

arXiv:0902.4308•Journal of Physics B Atomic Molecular and Optical Physics•May 15, 2009•5 citations
This paper presents a quantum mechanical treatment for both atomic and field fluctuations of an atomic ensemble interacting with propagating fields, either in Electromagnetically Induced Transparency or in a Raman situation. The atomic spin noise spectra and the outgoing field spectra are calculated in both situations. For suitable parameters both EIT and Raman schemes efficiently preserve the quantum state of the incident probe field in the transfer process with the atoms, although a single pass scheme is shown to be intrinsically less efficient than a cavity scheme.
We present a quantum mechanical treatment for both atomic and field fluctuations of an atomic ensemble interacting with propagating fields, either in electromagnetically induced transparency (EIT) or in a Raman situation. The atomic spin noise spectra and the outgoing field spectra are calculated in both situations. For suitable parameters both EIT and Raman schemes efficiently preserve the quantum state of the incident probe field in the transfer process with the atoms, although a single-pass scheme is shown to be intrinsically less efficient than a cavity scheme.
We show that a quasiperfect quantum-state transfer between an atomic ensemble and fields in an optical cavity can be achieved in electromagnetically induced transparency (EIT). A squeezed vacuum field state can be mapped onto the long-lived atomic spin associated to the ground-state sublevels of the $\ensuremath{\Lambda}$-type atoms considered. The EIT on-resonance situation show interesting similarities with the Raman off-resonant configuration. We then show how to transfer the atomic squeezing back to the field exiting the cavity, thus realizing a quantum memory--type operation.
We study here a different scheme involving a large ensemble of Lambda-type atoms, a control field, and the field to be stored and show how to transfer with a nearly 100% efficiency a quantum state of light (squeezed vacuum) into the ground state coherence of a spin-polarized atomic cloud. We find the best transfer conditions between the two oscillators. The quantum states are well conserved in two seemingly different situations: in the so-called electromagnetically-induced-transparency (EIT) situation (on one-and two-photon resonance) and in a Raman configuration (on two-photon resonance, but for large one-photon detunings). If both situations share interesting similarities in terms of transfer efficiency, and noise spectra, the physical effects responsible for the ideal mapping are quite different, and make the use of both room-temperature and cold atoms possible.
We show that a quasi-perfect quantum state transfer between anatomic ensemble and fields in an optical cavity can be achieved inElectromagnetically Induced Transparency (EIT). A squeezedvacuum field state can be mapped onto the long-lived atomic spinassociated to the ground state sublevels of the Lambda-typeatoms considered. The EIT on-resonance situation show interesting similaritieswith the Raman off-resonant configuration. We then show how totransfer the atomic squeezing back to the field exiting the cavity,thus realizing a quantum memory-type operation.
We present various schemes tomanipulate andstore quantumoptical fields into atomic ensembles andshowhowtorealize quantummemoryoperations, entangle atomic ensembles or teleport anatomic ensemble quantum state withhighefficiency. A major challenge inquantum information andcommunication lies intheability tomanipulate andstore quantum states ondemand. Quantum networks consisting ofatomic ensemble nodes connected bylight represent apromising, wayto achieve robust quantum communication. Because ofthelonglifetime oftheir ground state spin, atomic ensembles are goodcandidates tostore thequantum state ofoptical light fields. Wepropose ascheme toachieve quasi-perfect atom-field quantum state transfers inon-resonance Electromagnetically Induced Transparency (EIT) oroff-resonant Ramanconfigurations (11. Weshowthat dissipation isnegligible forsuch interactions, sothat thequantum states arepreserved during transfer operations. Wefirst showhowtomapabroadband squeezed vacuumontotheatomic ground state coherence ofaspin-polarized ensembles. Wefind theoptimal conditions forhighefficiency transfer andpresent amethod toreadout theatomic state inorder toperform aquantum memoryoperation (11. Wealso compare cavity andsingle passschemes; eventhough a cavity interaction turns outtobemoreefficient, single passinteraction should allow forverygoodquality transfer for realistic experimental parameters. We thenpropose toentangle twomacroscopic atomic ensembles using apairofEPR-correlated incident fields. Entanglement isalsoshowntobeconserved during on-resonant oroff-resonant interactions, andcanbestored fora longtimeintwospatially separated ensembles (2). Theatomic entanglement canthenbereadout intheoptical fields exiting thecavities.
Interaction of a control and a signal field with an ensemble of three-level atoms allows direct mapping of the quantum state of the signal field into long lived coherences of an atomic ground state. For a vapor of cesium atoms, using Electromagnetically Induced Transparency (EIT) and Zeeman coherences, we compare the case where a tunable single-sideband is stored independently of the other one to the case where the two symmetrical sidebands are stored using the same transparency window. We study the conditions in which simultaneous storage of two non-commuting variables carried by light and subsequent read-out is possible. We show that excess noise associated with spontaneous emission and spin relaxation is small, and we evaluate the quantum performance of our memory by measuring the signal transfer coefficient T and the conditional variance V and using the T-V criterion as a state independent benchmark.