Dear quanta,
This thesis defense should be of interest to many of us. Please contact
Mihir (cc'ed) if you haev questions.
Name: Mihir Pant
Title: Architectures for photon-mediated quantum information processing
Advisor: Dirk Englund
Date: Tues, Nov 14, 2017
Time: 2:30PM
Location: Grier A (34-401 A)
Abstract:
Quantum computing holds the promise of providing an exponential speedup for
several computational tasks. Quantum repeaters could allow long-distance
entanglement generation which can, in turn, enable distributed quantum
computation, secure communication, and precision sensing. However, building
a useful quantum computer or quantum repeater using currently known
architectures is beyond current experimental capabilities. Photon-mediated
quantum information processing may be a path to realizing such devices
because of the scalability offered by recent advances in integrated
photonics and the natural role of photons as information carriers.
Furthermore, the stochastic noise in photonic qubits can be much smaller
than ion-trap and superconducting qubits. On the other hand, photonic
architectures must often contend with other non-idealities like photon loss
and the probabilistic nature of linear optics. The resource requirements
for building an all-optical quantum repeater capable of beating the
repeaterless bound, using multiplexing based creation of photonic cluster
states, are studied. We find several improvements which reduce the resource
requirements by five orders of magnitude. We then analyze a ``one-way"
repeater based on the quantum parity code which reduces the resource
requirements by another order of magnitude. In order to further reduce the
resource requirements, ideas from percolation theory can be used to create
resource states for universal quantum computing from 3-photon GHZ states
without feed-forward. We develop a new framework for studying such
percolation-based creation of photonic clusters which is used to find
better lattices and find the the limits of such an approach. We use a
similar idea to develop an architecture for cluster state creation in a
system of atomic memories connected via photonic links, with an analysis
focussed on nitrogen vacancy (NV) centers in diamond. Finally, we develop
an entanglement routing protocols for quantum networks in which every node
only needs to perform entanglement swaps.
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