Universal linear optics
Jacques Carolan,Chris Harrold,Chris Sparrow,Chris Sparrow,Enrique Martin-Lopez,Nicholas Russell,Joshua W. Silverstone,Peter Shadbolt,Nobuyuki Matsuda,Manabu Oguma,Mikitaka Itoh,Graham D. Marshall,Mark G. Thompson,Jonathan C. F. Matthews,Toshikazu Hashimoto,Jeremy L. O'Brien,Anthony Laing +16 more
Reads0
Chats0
TLDR
In this paper, a sixmode universal system consisting of a cascade of 15 Mach-Zehnder interferometers with 30 thermo-optic phase shifters integrated into a single photonic chip was demonstrated.Abstract:
Linear optics underpins fundamental tests of quantum mechanics and quantum technologies. We demonstrate a single reprogrammable optical circuit that is sufficient to implement all possible linear optical protocols up to the size of that circuit. Our six-mode universal system consists of a cascade of 15 Mach-Zehnder interferometers with 30 thermo-optic phase shifters integrated into a single photonic chip that is electrically and optically interfaced for arbitrary setting of all phase shifters, input of up to six photons, and their measurement with a 12-single-photon detector system. We programmed this system to implement heralded quantum logic and entangling gates, boson sampling with verification tests, and six-dimensional complex Hadamards. We implemented 100 Haar random unitaries with an average fidelity of 0.999 ± 0.001. Our system can be rapidly reprogrammed to implement these and any other linear optical protocol, pointing the way to applications across fundamental science and quantum technologies.read more
Citations
More filters
Posted Content
Partial distinguishability and photon counting probabilities in linear multiport devices
TL;DR: In this article, the probability of photon counts at the output of a multiport optical device are generalised for optical sources of arbitrary quantum states in partially distinguishable optical modes, where the generating function for the probabilities is a linear combination of the matrix permanents of positive semi-definite Hermitian matrices.
Journal ArticleDOI
Component-wise testing of laser-written integrated coupled-mode beam splitters.
TL;DR: This work demonstrates a solution for component-wise testing of coupled-mode IBSs without limitations on component location and PIC architectures using imaging of an individual IBS with a custom-built multifunctional adaptive optical microscope and the calculation of its beam-splitting ratio through numerical modelling.
Journal ArticleDOI
Fidelity Restorable Universal Linear Optics
TL;DR: A novel Universal Generalized Mach–Zehnder Interferometer architecture is presented that migrates from U(2) decomposition techniques and adopts a recursive U(N), exploiting cascaded size‐augmenting N × N beam splitters and phase shifters and turns into the optimal architecture for constructing any real/complex‐valued matrix via the singular value decomposition (SVD) scheme.
Journal ArticleDOI
Universal discrete Fourier optics RF photonic integrated circuit architecture.
Trevor J. Hall,Mehedi Hasan +1 more
TL;DR: A coherent electro-optic circuit architecture that generates a frequency comb consisting of N spatially separated orders using a generalised Mach-Zenhder interferometer with its N × 1 combiner replaced by an optical N × N Discrete Fourier Transform (DFT).
Journal ArticleDOI
Characterization of optical quantum circuits using resonant phase shifts
Menno Poot,Hong X. Tang +1 more
TL;DR: In this article, the phase shift induced by integrated optical resonators is used to determine the phase of an unbalanced Mach-Zehnder interferometer and the coupling ratio of its directional couplers.
References
More filters
Book
Quantum Computation and Quantum Information
TL;DR: In this article, the quantum Fourier transform and its application in quantum information theory is discussed, and distance measures for quantum information are defined. And quantum error-correction and entropy and information are discussed.
Quantum Computation and Quantum Information
TL;DR: This chapter discusses quantum information theory, public-key cryptography and the RSA cryptosystem, and the proof of Lieb's theorem.
Journal ArticleDOI
A scheme for efficient quantum computation with linear optics.
TL;DR: It is shown that efficient quantum computation is possible using only beam splitters, phase shifters, single photon sources and photo-detectors and are robust against errors from photon loss and detector inefficiency.
Journal ArticleDOI
Measurement of subpicosecond time intervals between two photons by interference.
TL;DR: A fourth-order interference technique has been used to measure the time intervals between two photons, and by implication the length of the photon wave packet, produced in the process of parametric down-conversion.