TY - JOUR

T1 - Information capacity of a single photon

AU - Rohde, Peter P.

AU - Fitzsimons, Joseph F.

AU - Gilchrist, Alexei

N1 - Rohde, P. P., Fitzsimons, J. F., & Gilchrist, A. (2013). Information capacity of a single photon. Physical Review A, 88(2), 022310. Copyright (2013) by the American Physical Society. The original article can be found at http://dx.doi.org/10.1103/PhysRevA.88.022310

PY - 2013/8/9

Y1 - 2013/8/9

N2 - Quantum states of light are the obvious choice for communicating quantum information. To date, encoding information into the polarization states of single photons has been widely used as these states form a natural closed two-state qubit. However, photons are able to encode much more - in principle, infinite - information via the continuous spatiotemporal degrees of freedom. Here we consider the information capacity of an optical quantum channel, such as an optical fiber, where a spectrally encoded single photon is the means of communication. We use the Holevo bound to calculate an upper bound on the channel capacity, and relate this to the spectral encoding basis and the spectral properties of the channel. Further, we derive analytic bounds on the capacity of such channels, and, in the case of a symmetric two-state encoding, calculate the exact capacity of the corresponding channel.

AB - Quantum states of light are the obvious choice for communicating quantum information. To date, encoding information into the polarization states of single photons has been widely used as these states form a natural closed two-state qubit. However, photons are able to encode much more - in principle, infinite - information via the continuous spatiotemporal degrees of freedom. Here we consider the information capacity of an optical quantum channel, such as an optical fiber, where a spectrally encoded single photon is the means of communication. We use the Holevo bound to calculate an upper bound on the channel capacity, and relate this to the spectral encoding basis and the spectral properties of the channel. Further, we derive analytic bounds on the capacity of such channels, and, in the case of a symmetric two-state encoding, calculate the exact capacity of the corresponding channel.

UR - http://www.scopus.com/inward/record.url?scp=84884842436&partnerID=8YFLogxK

U2 - 10.1103/PhysRevA.88.022310

DO - 10.1103/PhysRevA.88.022310

M3 - Article

AN - SCOPUS:84884842436

VL - 88

SP - 1

EP - 6

JO - Physical Review A: covering atomic, molecular, and optical physics and quantum information

JF - Physical Review A: covering atomic, molecular, and optical physics and quantum information

SN - 2469-9926

IS - 2

M1 - 022310

ER -