Quantum memory for light

TY - GEN

T1 - Quantum memory for light

AU - Jüisgaara, B.

AU - Sherson, J.

AU - Polzik, E. S.

AU - Fiurášek, J.

AU - Cirac, J. I.

PY - 2005

Y1 - 2005

N2 - The phase and amplitude of a light pulse are two non-commuting variables and hence cannot be determined simultaneously and precisely. However quantum information can be encoded in these immeasurable quantities taken together. Quantum information science needs procedures for transferring a quantum state of light onto a quantum state of atoms in order to implement quantum networks. An experiment implementing such quantum memory for light utilizing an atomic spin polarized gas of Caesium atoms at room temperature (shown in the figure) has been recently performed [1]. In [1] an unknown weak coherent state of light containing a few photons is mapped and stored in the ground state of an atomic ensemble for 4 milliseconds. The fidelity of the mapping up to 70%, significantly higher than the benchmark classical memory fidelity [2] has been demonstrated. The storage protocol involves an off-resonant interaction of light with the spin polarized atomic memory, a subsequent quantum measurement on the transmitted light, and a feedback on atoms conditioned on the measurement result. Future plans for extending the memory performance towards other quantum states of light and the memory readout protocols will be described.

AB - The phase and amplitude of a light pulse are two non-commuting variables and hence cannot be determined simultaneously and precisely. However quantum information can be encoded in these immeasurable quantities taken together. Quantum information science needs procedures for transferring a quantum state of light onto a quantum state of atoms in order to implement quantum networks. An experiment implementing such quantum memory for light utilizing an atomic spin polarized gas of Caesium atoms at room temperature (shown in the figure) has been recently performed [1]. In [1] an unknown weak coherent state of light containing a few photons is mapped and stored in the ground state of an atomic ensemble for 4 milliseconds. The fidelity of the mapping up to 70%, significantly higher than the benchmark classical memory fidelity [2] has been demonstrated. The storage protocol involves an off-resonant interaction of light with the spin polarized atomic memory, a subsequent quantum measurement on the transmitted light, and a feedback on atoms conditioned on the measurement result. Future plans for extending the memory performance towards other quantum states of light and the memory readout protocols will be described.

UR - http://www.scopus.com/inward/record.url?scp=33847301047&partnerID=8YFLogxK

U2 - 10.1109/EQEC.2005.1567462

DO - 10.1109/EQEC.2005.1567462

M3 - Conference article

AN - SCOPUS:33847301047

SP - 296

JO - 2005 European Quantum Electronics Conference, EQEC '05

JF - 2005 European Quantum Electronics Conference, EQEC '05

T2 - 2005 European Quantum Electronics Conference, EQEC '05

Y2 - 12 June 2005 through 17 June 2005

ER -