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Polarization ququarts

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arxiv quant-ph/0602138 v1 pith:3NMDI4XR submitted 2006-02-16 quant-ph

Polarization ququarts

classification quant-ph
keywords quantumpolarizationstatesusedarbitrarybiphotoncommunicationconcept
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We discuss the concept of polarization states of four-dimensional quantum systems based on frequency non-degenerate biphoton field. Several quantum tomography protocols were developed and implemented for measurement of an arbitrary state of ququart. A simple method that does not rely on interferometric technique is used to generate and measure the sequence of states that can be used for quantum communication purposes.

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