Abstract
| Original language | English |
|---|---|
| Article number | 140501 |
| Number of pages | 6 |
| Journal | Physical Review Letters |
| Volume | 112 |
| Issue number | 14 |
| Early online date | 7 Apr 2014 |
| DOIs | |
| Publication status | Published - 11 Apr 2014 |
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Keywords
- entanglement
- discord
- quantum optics
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Experimental entanglement activation from discord in a programmable quantum measurement. / Adesso, Gerardo; D'ambrosio, Vincenzo; Nagali, Eleonora; Piani, Marco; Sciarrino, Fabio.
In: Physical Review Letters, Vol. 112, No. 14, 140501, 11.04.2014.Research output: Contribution to journal › Letter
TY - JOUR
T1 - Experimental entanglement activation from discord in a programmable quantum measurement
AU - Adesso, Gerardo
AU - D'ambrosio, Vincenzo
AU - Nagali, Eleonora
AU - Piani, Marco
AU - Sciarrino, Fabio
N1 - (c) American Physical Society
PY - 2014/4/11
Y1 - 2014/4/11
N2 - In quantum mechanics, observing is not a passive act. Consider a system of two quantum particles A and B: if a measurement apparatus M is used to make an observation on B, the overall state of the system AB will typically be altered. When this happens, no matter which local measurement is performed, the two objects A and B are revealed to possess peculiar correlations known as quantum discord. Here, we demonstrate experimentally that the very act of local observation gives rise to an activation protocol which converts discord into distillable entanglement, a stronger and more useful form of quantum correlations, between the apparatus M and the composite system AB. We adopt a flexible two-photon setup to realize a three-qubit system (A, B, M) with programmable degrees of initial correlations, measurement interaction, and characterization processes. Our experiment demonstrates the fundamental mechanism underpinning the ubiquitous act of observing the quantum world and establishes the potential of discord in entanglement generation.
AB - In quantum mechanics, observing is not a passive act. Consider a system of two quantum particles A and B: if a measurement apparatus M is used to make an observation on B, the overall state of the system AB will typically be altered. When this happens, no matter which local measurement is performed, the two objects A and B are revealed to possess peculiar correlations known as quantum discord. Here, we demonstrate experimentally that the very act of local observation gives rise to an activation protocol which converts discord into distillable entanglement, a stronger and more useful form of quantum correlations, between the apparatus M and the composite system AB. We adopt a flexible two-photon setup to realize a three-qubit system (A, B, M) with programmable degrees of initial correlations, measurement interaction, and characterization processes. Our experiment demonstrates the fundamental mechanism underpinning the ubiquitous act of observing the quantum world and establishes the potential of discord in entanglement generation.
KW - entanglement
KW - discord
KW - quantum optics
UR - http://journals.aps.org/prl/
U2 - 10.1103/PhysRevLett.112.140501
DO - 10.1103/PhysRevLett.112.140501
M3 - Letter
VL - 112
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 14
M1 - 140501
ER -