Colloquium: The Einstein-Podolsky-Rosen paradox: From concepts to applications
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Citations
Quantum entanglement for systems of identical bosons: I. General features
Long-Distance Continuous-Variable Quantum Key Distribution with Entangled States
Quantum steering of multimode Gaussian states by Gaussian measurements: monogamy relations and the Peres conjecture
No-cloning of quantum steering
Realization of the Einstein-Podolsky-Rosen Paradox Using Radial Position and Radial Momentum Variables.
References
Can Quantum-Mechanical Description of Physical Reality Be Considered Complete?
Teleporting an unknown quantum state via dual classical and Einstein-Podolsky-Rosen channels
Entanglement of Formation of an Arbitrary State of Two Qubits
Proposed Experiment to Test Local Hidden Variable Theories.
A suggested interpretation of the quantum theory in terms of "hidden" variables. ii
Related Papers (5)
Frequently Asked Questions (17)
Q2. What is the squeezing parameter in steady-state continuous-wave experiments?
In these steady-state continuous-wave experiments, however, the squeezing parameter r is time independent, and given by the inputoutput parametric gain G, such that G=e2r.
Q3. Why was the use of a cavity circumvented?
Due to the high peak powers of the frequency doubled pulses as well as the particular choice of a highly nonlinear optical material KNBO3 , the use of a cavity was circumvented despite the fact that a very thin 100 m crystal was employed.
Q4. How can the authors test quantum theory for increasingly macroscopic systems?
Using fieldquadrature measurements and multiparticle states, it is likely that quantum theory and its alternatives can be tested for increasingly macroscopic systems Marshall et al., 2003 using the EPR paradox.
Q5. What was the recent use of a traveling-wave OPA?
A degenerate waveguide technique, together with a beam splitter, was recently used to demonstrate pulsed entanglement using a traveling-wave OPA Zhang et al., 2007 .
Q6. What is the decoherence rate of atomic ensembles?
One might expect that since spin-squeezed and entangled atomic ensembles contain a large number N of atoms, the decoherence rate of such systems would scale as N , where is the single-atom decay rate.
Q7. What is the critical feature of the collective spin states?
a critical feature of these collective spin states is that excitation due to interaction with light is distributed symmetrically amongst all of the atoms.
Q8. What is the way to measure teleportation efficacy?
A well-accepted measure of teleportation efficacy is the overlap of the wave function of the output state with the original input state.
Q9. What is the logical choice for labeling the element of reality by the outcomes?
Since the set of predicted distributions are the conditionals P x xB , one for each value of xB, the logical choice is to label the element of reality by the outcomes xB, but bearing in mind the set of predetermined results is not the set xB , but is the set of associated conditional distributions P x xB .
Q10. How many fidelitys can be obtained using classical measure and regenerate strategies?
For a Gaussian distribution of coherent states, with mean photon number n̄, the average fidelity using classical measure and regenerate strategies is limited to F n̄+1 / 2n̄+1
Q11. What frequency band was used to characterize the quantum noise properties?
The quantum noise properties were characterized at a specific Fourier component within a narrow frequency band, typically in the range 100–300 kHz.
Q12. What is the first experimental realization of pulsed EPR entanglement?
The first experimental realization of pulsed EPR entanglement, shown in Fig. 7, was based on the approach of mixing two squeezed beams on a 50/50 beam splitteras outlined above for continuous wave light.
Q13. How many entangled beams did Silberhorn et al. find a degree?
The symmetry of the entangled beams allowed one to infer from this number the degree of EPR violation, which was found to be 2=0.64±0.08.
Q14. What are the techniques that can be used to test the EPR paradox?
These techniques have significant potential for quantum information networks Duan et al., 2001 and are also capable of generating a collective entangled state of the form required to test the EPR paradox.
Q15. What is the other approach to demonstrating collective spin entanglement in atomic ensembles?
The other approach to experimental demonstration of collective spin entanglement in atomic ensembles is to rely on conditioning measurements to prepare the state Julsgaard et al., 2004; Chou et al., 2005 .
Q16. What was the optimum level of EPR paradox achieved to date?
The optimum level of EPR paradox achieved to date was by Bowen, Schnabel, et al. 2003 using a pair of type The authoroptical parametric oscillators.
Q17. Who performed the first experimental demonstration of quantum state transfer from the polarization state of an optical?
The first experimental demonstration of quantum state transfer from the polarization state of an optical field to the collective spin state of an atomic ensemble was performed by Hald et al.