title: Manipulating biphotonic qutrits.
abstract: Quantum information carriers with higher dimension than the canonical qubit offer significant advantages. However, manipulating such systems is extremely difficult. We show how measurement-induced nonlinearities can dramatically extend the range of possible transforms on biphotonic qutrits-three-level quantum systems formed by the polarization of two photons in the same spatiotemporal mode. We fully characterize the biphoton-photon entanglement that underpins our technique, thereby realizing the first instance of qubit-qutrit entanglement. We discuss an extension of our technique to generate qutrit-qutrit entanglement and to manipulate any bosonic encoding of quantum information.
authors: Department of Physics and Centre for Quantum Computer Technology, University of Queensland, Brisbane, Australia.
authors: B P
authors: BP
authors: Lanyon
authors: T J
authors: TJ
authors: Weinhold
authors: N K
authors: NK
authors: Langford
authors: J L
authors: JL
authors: O'Brien
authors: K J
authors: KJ
authors: Resch
authors: A
authors: A
authors: Gilchrist
authors: A G
authors: AG
authors: White