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1972
Earlier work this paper cites.
D. L. Sullivan, Appl. Opt. 11
1972
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M.-D. Choi, Linear Algebra Appl. 12
1975
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Y. Aharonov, J. Anandan, S. Popescu, and L. Vaidman, Phys. Rev. Lett. 64
1990
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C. Tamm and C. Weiss, J. Opt. Soc. Amer. B 7
1990
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M. W. Beijersbergen, L. Allen, H. V. der Veen, and J. P. Woerdman, Opt. Commun. 96
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1999
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N. J. Cerf, M. Bourennane, A. Karlsson, and N. Gisin, Phys. Rev. Lett. 88
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J. Leach, J. Courtial, K. Skeldon, S. M. Barnett, S. Franke-Arnold, and M. J. Padgett, Phys. Rev. Lett. 92
2004
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G. Gutoski and J. Watrous, in Proceedings of 39th ACM STOC (2006) pp. 565–574, arXiv:quant-ph/0611234
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2018

Indefinite Causal Order in a Quantum Switch

Goswami, K., Giarmatzi, C., Kewming, M. et al.

Understand

In quantum mechanics events can happen in no definite causal order: in practice this can be verified by measuring a causal witness, in the same way that an entanglement witness verifies entanglement.

Indefinite causal order can be observed in a quantum switch, where two operations act in a quantum superposition of the two possible orders.
Here we realise a photonic quantum switch, where polarisation coherently controls the order of two operations, $\hat{A}$ and $\hat{B}$, on the transverse spatial mode of the photons.
Our setup avoids the limitations of earlier implementations: the operations cannot be distinguished by spatial or temporal position.

Built on

A. Jamiołkowski, Rep. Math. Phys. 3
1972
Earlier work this paper cites.
D. L. Sullivan, Appl. Opt. 11
1972
Earlier work this paper cites.
M.-D. Choi, Linear Algebra Appl. 12
1975
Earlier work this paper cites.
Y. Aharonov, J. Anandan, S. Popescu, and L. Vaidman, Phys. Rev. Lett. 64
1990
Earlier work this paper cites.
C. Tamm and C. Weiss, J. Opt. Soc. Amer. B 7
1990
Earlier work this paper cites.
M. W. Beijersbergen, L. Allen, H. V. der Veen, and J. P. Woerdman, Opt. Commun. 96
1993
Earlier work this paper cites.
M. J. Padgett and J. P. Lesso, J. Mod. Opt. 46
1999
Earlier work this paper cites.
N. J. Cerf, M. Bourennane, A. Karlsson, and N. Gisin, Phys. Rev. Lett. 88
Original
2002
Earlier work this paper cites.
J. Leach, J. Courtial, K. Skeldon, S. M. Barnett, S. Franke-Arnold, and M. J. Padgett, Phys. Rev. Lett. 92
2004
Earlier work this paper cites.
G. Gutoski and J. Watrous, in Proceedings of 39th ACM STOC (2006) pp. 565–574, arXiv:quant-ph/0611234
2006
Earlier work this paper cites.
L. Hardy, J. Phys. A: Math. Gen. 40
2007
Earlier work this paper cites.