22-30 July 2021
North-West University
Africa/Johannesburg timezone
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Generation of GHZ states via projected squeezed states

26 Jul 2021, 11:45
Potchefstroom Campus (North-West University)

Potchefstroom Campus

North-West University

Oral Presentation Track G - Theoretical and Computational Physics Theoretical and Computational Physics


Mr Byron Alexander (Stellenbosch University)


Emerging quantum technologies rely principally on quantum phenomena such as superposition and entanglement for their unique capabilities. To this end, it is essential to develop well-defined and efficient protocols to produce and further exercise control over states of quantum bits that exhibit desired quantum mechanical traits. From a pure separable multipartite state, a control sequence, which includes rotation, spin squeezing via one-axis twisting, quantum measurement and post-selection, generates a highly entangled multipartite state, which we refer to as a Projected Squeezed ($PS$) state. Through an optimization method, we then identify parameters required to maximize the overlap fidelity of the $PS$ state with the maximally entangled Greenberger-Horne-Zeilinger ($GHZ$) state. The method leads to an appreciable decrease in the state preparation time of $n$-qubit $GHZ$ states when compared to preparation through unitary evolution. The efficiency of the $PS$ state protocol is studied in non-ideal experimentally relevant settings by simulating decoherence channels using numerical methods.

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Primary author

Mr Byron Alexander (Stellenbosch University)


Dr Bollinger John (National Institute of Standards and Technology (NIST)) Prof. Tame Mark (Stellenbosch University)

Presentation Materials

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