Noise excess free record/upload of non-classical states to continuous-variable quantum memory

Abstract

In a recent continuous-variable quantum memory experiment, one quadrature of light pulse is directly uploaded by the light-atom coupling whereas complementary quadrature is obtained by homodyne measurement of the out-coupled light. Subsequently, information from homodyne mea- surement is written into the memory by feed-back electro-optical control of the atomic state. Using the same experimental set-up, a deterministic noise excess free record of unknown quantum states to continuous-variable quantum atomic memory is proposed. Further, the memory experiment is extended by the pre-squeezing of the recorded state of light and squeezing post-correction of the recorded state. To upload a resource to the memory, as single-photon state or superposition of co- herent states, the post-selection of the measurement results from homodyne detection is suggested. Then such the probabilistic upload approaches even a lossless transfer of these highly nonclassical states into the quantum memory.

8 pages, 5 figures, submitted September 11, 2007

References in corpus (17)

• A computable measure of entanglement
• Quantum information with continuous variables
• Inseparability criterion for continuous variable systems
• Experimental demonstration of quantum memory for light
• Quantum computation with optical coherent states
• Quantum State Transfer Between Matter and Light
• Controllable generation of highly nonclassical states from nearly pure squeezed vacua
• Collective attacks and unconditional security in continuous variable quantum key distribution
• High purity bright single photon source
• Security bounds for continuous variables quantum key distribution
• Nonclassical character of statistical mixtures of the single-photon and vacuum optical states
• Production of superpositions of coherent states in traveling optical fields with inefficient photon detection
• Efficient quantum memory and entanglement between light and an atomic ensemble using magnetic fields
• Light Qubit Storage and Retrieval using Macroscopic Atomic Ensembles
• Quantum State Engineering with Continuous-Variable Post-Selection
• Conditional quantum-state engineering using ancillary squeezed-vacuum states
• Enhancing the capacity and performance of collective atomic quantum memory

Cited by in corpus (10)

• A Quantum Optomechanical Interface Beyond the Resolved Sideband Limit
• Quantum transduction with adaptive control
• High-fidelity bosonic quantum state transfer using imperfect transducers and interference
• Noise resilient quantum interface based on QND interaction
• Generating mechanical and optomechanical entanglement via pulsed interaction and measurement
• Squeezer-based pulsed optomechanical interface
• Nonlocal quantum gate on quantum continuous variables with minimum resources
• Conditional preparation of arbitrary atomic Dicke states
• Gaussification of quantum states of traveling light beams in atomic memory
• Macroscopic Schrödinger-cat states of nonequilibrium electrons induced by cat-state optical driving and projective measurements on the light field