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Constructions of Mutually Unbiased Bases

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arxiv quant-ph/0309120 v1 pith:53RJVT6X submitted 2003-09-15 quant-ph cs.ET

Constructions of Mutually Unbiased Bases

classification quant-ph cs.ET
keywords basesmutuallyunbiasedcontainingarbitrarycalledcannotcomplex
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Two orthonormal bases B and B' of a d-dimensional complex inner-product space are called mutually unbiased if and only if |<b|b'>|^2=1/d holds for all b in B and b' in B'. The size of any set containing (pairwise) mutually unbiased bases of C^d cannot exceed d+1. If d is a power of a prime, then extremal sets containing d+1 mutually unbiased bases are known to exist. We give a simplified proof of this fact based on the estimation of exponential sums. We discuss conjectures and open problems concerning the maximal number of mutually unbiased bases for arbitrary dimensions.

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