skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Remote Preparation of an Atomic Quantum Memory

Abstract

Storage and distribution of quantum information are key elements of quantum information processing and future quantum communication networks. Here, using atom-photon entanglement as the main physical resource, we experimentally demonstrate the preparation of a distant atomic quantum memory. Applying a quantum teleportation protocol on a locally prepared state of a photonic qubit, we realized this so-called remote state preparation on a single, optically trapped {sup 87}Rb atom. We evaluated the performance of this scheme by the full tomography of the prepared atomic state, reaching an average fidelity of 82%.

Authors:
; ; ;  [1];  [1];  [2]
  1. Department fuer Physik, Ludwig-Maximilians Universitaet Muenchen, D-80799 Munich (Germany)
  2. (Germany)
Publication Date:
OSTI Identifier:
20955410
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 98; Journal Issue: 5; Other Information: DOI: 10.1103/PhysRevLett.98.050504; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; DATA TRANSMISSION; INFORMATION THEORY; PERFORMANCE; PHOTONS; QUANTUM ENTANGLEMENT; QUANTUM MECHANICS; QUANTUM TELEPORTATION; QUBITS; RUBIDIUM 87; TOMOGRAPHY

Citation Formats

Rosenfeld, Wenjamin, Berner, Stefan, Volz, Juergen, Weber, Markus, Weinfurter, Harald, and Max-Planck Institut fuer Quantenoptik, D-85748 Garching. Remote Preparation of an Atomic Quantum Memory. United States: N. p., 2007. Web. doi:10.1103/PHYSREVLETT.98.050504.
Rosenfeld, Wenjamin, Berner, Stefan, Volz, Juergen, Weber, Markus, Weinfurter, Harald, & Max-Planck Institut fuer Quantenoptik, D-85748 Garching. Remote Preparation of an Atomic Quantum Memory. United States. doi:10.1103/PHYSREVLETT.98.050504.
Rosenfeld, Wenjamin, Berner, Stefan, Volz, Juergen, Weber, Markus, Weinfurter, Harald, and Max-Planck Institut fuer Quantenoptik, D-85748 Garching. Fri . "Remote Preparation of an Atomic Quantum Memory". United States. doi:10.1103/PHYSREVLETT.98.050504.
@article{osti_20955410,
title = {Remote Preparation of an Atomic Quantum Memory},
author = {Rosenfeld, Wenjamin and Berner, Stefan and Volz, Juergen and Weber, Markus and Weinfurter, Harald and Max-Planck Institut fuer Quantenoptik, D-85748 Garching},
abstractNote = {Storage and distribution of quantum information are key elements of quantum information processing and future quantum communication networks. Here, using atom-photon entanglement as the main physical resource, we experimentally demonstrate the preparation of a distant atomic quantum memory. Applying a quantum teleportation protocol on a locally prepared state of a photonic qubit, we realized this so-called remote state preparation on a single, optically trapped {sup 87}Rb atom. We evaluated the performance of this scheme by the full tomography of the prepared atomic state, reaching an average fidelity of 82%.},
doi = {10.1103/PHYSREVLETT.98.050504},
journal = {Physical Review Letters},
number = 5,
volume = 98,
place = {United States},
year = {Fri Feb 02 00:00:00 EST 2007},
month = {Fri Feb 02 00:00:00 EST 2007}
}
  • Remote plasma atomic layer deposited (RPALD) Al{sub 2}O{sub 3} films were investigated to apply as tunnel and blocking layers in the metal-oxide-semiconductor capacitor memory utilizing Au nanocrystals (NCs) for nonvolatile memory applications. The interface stability of an Al{sub 2}O{sub 3} film deposited by RPALD was studied to observe the effects of remote plasma on the interface. The interface formed during RPALD process has high oxidation states such as Si{sup +3} and Si{sup +4}, indicating that RPALD process can grow more stable interface which has a small amount of fixed oxide trap charge. The significant memory characteristics were also observed inmore » this memory device through the electrical measurement. The memory device exhibited a relatively large memory window of 5.6 V under a 10/-10 V program/erase voltage and also showed the relatively fast programming/erasing speed and a competitive retention characteristic after 10{sup 4} s. These results indicate that Al{sub 2}O{sub 3} films deposited via RPALD can be applied as the tunnel and blocking oxides for next-generation flash memory devices.« less
  • We propose how to prepare four remote logical qubits, with each in a separate cavity and encoded in the decoherence-free subspace by two atoms, into various entangled states. By means of the cavity-assisted photon scattering, we can link the four remote logical qubits in different cavities to be, respectively, W state, Greenberger-Horne-Zeilinger state, and cluster state, which are important in view of the distributed quantum information processing. The generation of the latter two entangled states can be theoretically generalized to many-qubit cases. Because our qubits are defined in dephasing-free subspace, our scheme is immune to dephasing during or even aftermore » the entanglement preparation.« less
  • We study a quantum information storage scheme based on an atomic ensemble with near (also exact) three-photon resonance electromagnetically induced transparency (EIT). Each 4-level-atom is coupled to two classical control fields and a quantum probe field. Quantum information is adiabatically stored in the associated dark polariton manifold. An intrinsic nontrivial topological structure is discovered in our quantum memory implemented through the symmetric collective atomic excitations with a hidden SU(3) dynamical symmetry. By adiabatically changing the Rabi frequencies of two classical control fields, the quantum state can be retrieved up to a non-Abelian holonomy and thus decoded from the final statemore » in a purely geometric way.« less
  • 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.
  • Present schemes involving the quantum nondemolition interaction between atomic samples and off-resonant light pulses allow us to store quantum information corresponding to a single harmonic oscillator (mode) in one multiatomic system. We discuss the possibility of involving several coherences of each atom so that the atomic sample can store information contained in several quantum modes. This is achieved by the coupling of different magnetic sublevels of the relevant hyperfine level by additional Raman pulses. This technique allows us to design not only the quantum nondemolition coupling, but also beam splitterlike and two-mode squeezerlike interactions between light and collective atomic spin.