2015/07/31 by J. Petrovic, Jovana Petrović, J. J. P. Veerman · 7 citations
Engineering · Mathematics · Physics and Astronomy · #Advanced Photonic Communication Systems #Computer science #Context (archaeology) #Coupling (piping) #Eigenvalues and eigenvectors #Electrical engineering #Electronic circuit #Optical Network Technologies #Optics #Parallel computing #Photonic and Optical Devices #Physics #Quantum #Quantum mechanics #Qubit #Topology (electrical circuits) #Transfer (computing) #Waveguide #math-ph #math.MP #physics.optics
paper · pdf · doi:10.1016/j.aop.2018.03.008
published in Annals of Physics 392, 128-141 (Elsevier BV)
openalex publication_date 2018/03/15 · openalex created_date 2018/03/29 · arxiv created 2018/04/27 · arxiv updated 2018/04/30 · openalex updated_date 2026/08/05
The faithful state transfer is an important requirement in the construction of classical and quantum computers. While the high-speed transfer is realized by optical-fibre interconnects, its implementation in integrated optical circuits is affected by cross-talk. The cross-talk between densely packed optical waveguides limits the transfer fidelity and distorts the signal in each channel, thus severely impeding the parallel transfer of states such as classical registers, multiple qubits and qudits. Here, we leverage on the suitably engineered cross-talk between waveguides to achieve the parallel transfer on optical chip. Waveguide coupling coefficients are designed to yield commensurate eigenvalues of the array and hence, periodic revivals of the input state. While, in general, polynomially complex, the inverse eigenvalue problem permits analytic solutions for small number of waveguides. We present exact solutions for arrays of up to nine waveguides and use them to design realistic buses for multi-(qu)bit and qudit transfer. Advantages and limitations of the proposed solution are discussed in the context of available fabrication techniques.