Experimental long-lived entanglement of two macroscopic objects
arXiv:quant-ph/0106057 · doi:10.1038/35096524
Abstract
Entanglement is considered to be one of the most profound features of quantum mechanics. An entangled state of a system consisting of two subsystems cannot be described as a product of the quantum states of the two subsystems. In this sense the entangled system is considered inseparable and nonlocal. It is generally believed that entanglement manifests itself mostly in systems consisting of a small number of microscopic particles. Here we demonstrate experimentally the entanglement of two objects, each consisting of about 10^12 atoms. Entanglement is generated via interaction of the two objects - more precisely, two gas samples of cesium atoms - with a pulse of light, which performs a non-local Bell measurement on collective spins of the samples. The entangled spin state can be maintained for 0.5 millisecond. Besides being of fundamental interest, the robust, long-lived entanglement of material objects demonstrated here is expected to be useful in quantum information processing, including teleportation of quantum states of matter and quantum memory.
Submitted to Nature, June 9, 2001, 11 pages, 3 figures. Contents changed following referees' suggestions
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- Entangled microwaves as a resource for entangling spatially separate solid-state qubits: superconducting qubits, NV centers and magnetic molecules
- EPR-entangled Bose-Einstein condensates in state-dependent potentials: a dynamical study
- Study of Rb - vapor coated cell; atomic diffusion and cell curing process
- Correlation-based entanglement criterion in bipartite multiboson systems
- Solid state multi-ensemble quantum computer in waveguide circuit model
- Quasideterministic generation of maximally entangled states of two mesoscopic atomic ensembles by adiabatic quantum feedback
- Towards Heisenberg Limit in Magnetometry with Parametric Down Converted Photons
- Multimode analysis of non-classical correlations in double well Bose-Einstein condensates
- Quantum feedback control of atomic ensembles and spinor Bose-Einstein condensates
- Optomechanical Entanglement between an Ion and an Optical Cavity Field
- How to Measure the Quantum State of Collective Atomic Spin Excitation
- Optical reconstruction of collective density matrix of qutrit
- Nonlocality of a free atomic wave packet
- Heralded Entanglement of Arbitrary Degree in Remote Qubits
- Macroscopic distant magnon-mode entanglement via a squeezed drive
- Entanglement distribution revealed by macroscopic observations
- Observations of magnetic field induced contraction of fission yeast cells using optical projection microscopy
- Trajectories without quantum uncertainties in composite systems with disparate energy spectra
- Nonclassicality and entanglement for wavepackets
- Long-lived mesoscopic entanglement between two damped infinite harmonic chains
- Magic frequencies in atom-light interaction for precision probing of the density matrix
- Asymmetric particle-antiparticle Dirac equation: first quantization
- A number filter for matter-waves
- Simultaneous Quantum Squeezing of Light Polarizations and Atomic Spins in a Cold Atomic Gas
- Quantum Mechanical Aspects of Cell Microtubules: Science Fiction or Realistic Possibility?
- Classical noise, Quantum noise and Secure communication
- On Multiparticle Entanglement via Resonant Interaction between Light and atomic Ensembles
- Hybrid approximation approach to generation of atomic squeezing with quantum nondemolition measurements
- Scattering of a composite quasiparticle by an impurity on a lattice
- Entanglement of bosonic modes in symmetric graphs
- Partial-transpose-guided entanglement classes and minimum noise filtering in many-body Gaussian quantum systems
- Irreversible photon transfer in an ensemble of -type atoms and photon diode
- Quantum walks and entanglement in cavity networks
- A binary mixture of Bose-Einstein-condensates in a double-well potential: Berry phase and two-mode entanglement
- Measurement schemes for the spin quadratures on an ensemble of atoms
- All-mechanical quantum noise cancellation for accelerometry: broadband with momentum measurements, narrow band without
- On the Potential of Microtubules for Scalable Quantum Computation
- Position- and momentum-squeezed quantum states in micro-scale mechanical resonators
- Optical protection of alkali-metal atoms from spin relaxation
- Entanglement Concentration for two atomic ensembles using an effective atom-light beamsplitter
- Calibration of Spin-Light Coupling by Coherently Induced Faraday Rotation
- Discovery of entanglement generation by elastic collision to realise the original Einstein-Podolsky-Rosen thought experiment
- Simulating the coupling of angular momenta in distant matter qubits
- Approximate quantum non-demolition measurements
- Optical response of a misaligned and suspended Fabry-Perot cavity
- Preparation of multi-party entanglement of individual photons and atomic ensembles
- A quantum-chaotic cesium-vapor magnetometer
- Entanglement gain in measurements with unknown results
- Quantification of Quantum Entanglement in a Multiparticle System of Two-Level Atoms Interacting with a Squeezed Vacuum State of the Radiation Field
- Deterministic entanglement generation between a pair of atoms on different Rydberg states via chirped adiabatic passage
- Decoherence induced spin squeezing signatures in Greenberger-Horne-Zeilinger and W states
- Non-Gaussian macroscopic entanglement of motion in a hybrid electromechanical device
- How many atoms get excited when they decay?
- Molecular Processes as Quantum Information Resources
- A total measure of multi-particle quantum correlations in atomic Schrödinger cat states
- Parallel two-qubit entangling gates via a quantum nondemolition interaction controlled by rotation
- Macroscopic quantum teleportation with ensembles of qubits
- Gaussification of quantum states of traveling light beams in atomic memory
- Dynamically stable two-mode squeezing in cavity optomechanics
- Dynamical stability of entanglement between spin ensembles
- Validation of entanglement purification by continuous variable polarization
- Error estimation of different schemes to measure spin-squeezing inequalities
- Scheme for demonstrating Bell theorem in tripartite entanglement between atomic ensembles
- Measure of tripartite quantum correlation in multiqubit symmetric pure state
- Neutral atom entangling gate in the ultrastrong coupling regime
- Optical entanglement facilitated by a hot mechanical oscillator
- Quantum states preparation of an atomic ensemble via cavity-assisted homodyne measurement
- Autonomous stabilization of remote entanglement in a cascaded quantum network
- Beyond pure state entanglement for atomic ensembles