A Cat-State Benchmark on a Seven Bit Quantum Computer

Details A Cat-State Benchmark on a Seven Bit Quantum Computer A Cat-State Benchmark on a Seven Bit Quantum Computer

1999-08-15

arxiv.org/abs/quant-ph/9908051v1

Physics

Quantum Physics

6 pages with figures

Scientific paper

We propose and experimentally realize an algorithmic benchmark that demonstrates coherent control with a sequence of quantum operations that first generates and then decodes the cat state (|000...>+|111...>)/sqrt(2) to the standard initial state |000...>. This is the first high fidelity experimental quantum algorithm on the currently largest physical quantum register, which has seven quantum bits (qubits) provided by the nuclei of crotonic acid. The experiment has the additional benefit of verifying a seven coherence in a generic system of coupled spins. Our implementation combines numerous nuclear magnetic resonance (NMR) techniques in one experiment and introduces practical methods for translating quantum networks to control operations. The experimental procedure can be used as a reliable and efficient method for creating a standard pseudo-pure state, the first step for implementing traditional quantum algorithms in liquid state NMR. The benchmark and the techniques can be adapted for use on other proposed quantum devices.

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