Built on

Princeton Univ. Press, Princeton, NJ, 1955
J. Von Neumann, Mathematical Foundations of Quantum Mechanics · 1955
Earlier work this paper cites.
J. Bell, “On the Einstein Podolsky Rosen Paradox,” Physics
1964
Earlier work this paper cites.
Springer Netherlands, Dordrecht, 1975
S. Kochen and E. P. Specker, The Problem of Hidden Variables in Quantum Mechanics · 1975
Earlier work this paper cites.
M.-D. Choi, “Completely positive linear maps on complex matrices,” Linear Algebra and its Applications
1975
Earlier work this paper cites.
A. Royer, “Wigner function in Liouville space: A canonical formalism,” Phys. Rev. A
1991
Earlier work this paper cites.
S. L. Braunstein, G. M. D’Ariano, G. J. Milburn, and M. F. Sacchi, “Universal Teleportation with a Twist,” Phys. Rev. Lett
2000
Earlier work this paper cites.
M. Steiner, “Generalized robustness of entanglement,” Phys. Rev. A
2003
Earlier work this paper cites.
T. Kim, M. Fiorentino, and F. N. C. Wong, “Phase-stable source of polarization-entangled photons using a polarization Sagnac interferometer,” Phys. Rev. A
2006
Earlier work this paper cites.

Similar

Springer Netherlands, Dordrecht, 2009
L. Hardy, Quantum Gravity Computers: On the Theory of Computation with Indefinite Causal Structure · 2009
Cited alongside, same era.
O. Gühne and G. Tóth, “Entanglement detection,” Physics Reports
Original
2009
Cited alongside, same era.
G. Chiribella, “Perfect discrimination of no-signalling channels via quantum superposition of causal structures,” Phys. Rev. A
Original
2012
Cited alongside, same era.
O. Oreshkov, F. Costa, and C. Brukner, “Quantum correlations with no causal order,” Nat. Commun
Original
2012
Cited alongside, same era.
G. Chiribella, G. M. D’Ariano, P. Perinotti, and B. Valiron, “Quantum computations without definite causal structure,” Phys. Rev. A
Original
2013

Then

June, 2014
A. Baumeler and S. Wolf, “Perfect signaling among three parties violating predefined causal order,” in 2014 IEEE International Symposium on Information Theory · 2014
Later among the works it cites.
N. Friis, V. Dunjko, W. Dür, and H. J. Briegel, “Implementing quantum control for unknown subroutines,” Phys. Rev. A
2014
Later among the works it cites.
A. Feix, M. Araújo, and C. Brukner, “Quantum superposition of the order of parties as a communication resource,” Phys. Rev. A
Original
2015
Later among the works it cites.
L. M. Procopio, A. Moqanaki, M. Araújo, F. Costa, I. Alonso Calafell, E. G. Dowd, D. R. Hamel, L. A. Rozema, C. Brukner, and P. Walther, “Experimental superposition of orders of quantum gates,” Nat. Commun
Original
2015
Later among the works it cites.
M. Araújo, C. Branciard, F. Costa, A. Feix, C. Giarmatzi, and C. Brukner, “Witnessing causal nonseparability,” New Journal of Physics
Original

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2016

Experimental Verification of an Indefinite Causal Order

Rubino, Giulia, Rozema, Lee A., Feix, Adrien et al.

Understand

Investigating the role of causal order in quantum mechanics has recently revealed that the causal distribution of events may not be a-priori well-defined in quantum theory.

While this has triggered a growing interest on the theoretical side, creating processes without a causal order is an experimental task.
Here we report the first decisive demonstration of a process with an indefinite causal order.
To do this, we quantify how incompatible our set-up is with a definite causal order by measuring a 'causal witness'.

Built on

Princeton Univ. Press, Princeton, NJ, 1955
J. Von Neumann, Mathematical Foundations of Quantum Mechanics · 1955
Earlier work this paper cites.
J. Bell, “On the Einstein Podolsky Rosen Paradox,” Physics
1964
Earlier work this paper cites.
Springer Netherlands, Dordrecht, 1975
S. Kochen and E. P. Specker, The Problem of Hidden Variables in Quantum Mechanics · 1975
Earlier work this paper cites.
M.-D. Choi, “Completely positive linear maps on complex matrices,” Linear Algebra and its Applications
1975
Earlier work this paper cites.
A. Royer, “Wigner function in Liouville space: A canonical formalism,” Phys. Rev. A
1991
Earlier work this paper cites.
S. L. Braunstein, G. M. D’Ariano, G. J. Milburn, and M. F. Sacchi, “Universal Teleportation with a Twist,” Phys. Rev. Lett
2000
Earlier work this paper cites.
M. Steiner, “Generalized robustness of entanglement,” Phys. Rev. A
2003
Earlier work this paper cites.
T. Kim, M. Fiorentino, and F. N. C. Wong, “Phase-stable source of polarization-entangled photons using a polarization Sagnac interferometer,” Phys. Rev. A
2006
Earlier work this paper cites.