The spatial structure of single photons1, 2, 3 is becoming an extensively explored resource to facilitate free-space quantum communication4, 5, 6, 7 and quantum computation8 as well as for benchmarking the limits of quantum entanglement generation3 with orbital angular momentum modes1, 9 or reduction of the photon free-space propagation speed10. Although accurate tailoring of the spatial structure of photons is now routinely performed using methods employed for shaping classical optical beams3, 10, 11, the reciprocal problem of retrieving the spatial phase-amplitude structure of an unknown single photon cannot be solved using complementary classical holography techniques12, 13 that are known for excellent interferometric precision. Here, we introduce a method to record a hologram of a single photon that is probed by another reference photon, on the basis of a different concept of the quantum interference between two-photon probability amplitudes. As for classical holograms, the hologram of a single photon encodes the full information about the photon's ‘shape’ (that is, its quantum wavefunction) whose local amplitude and phase are retrieved in the demonstrated experiment.
At a glance
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- Supplementary information (1.65 MB)