Experimental characterisation of unsharp qubit observables and
sequential measurement incompatibility via quantum random access codes
- URL: http://arxiv.org/abs/2001.04768v2
- Date: Mon, 27 Jul 2020 18:27:04 GMT
- Title: Experimental characterisation of unsharp qubit observables and
sequential measurement incompatibility via quantum random access codes
- Authors: Hammad Anwer, Sadiq Muhammad, Walid Cherifi, Nikolai Miklin, Armin
Tavakoli and Mohamed Bourennane
- Abstract summary: We report an experimental implementation of unsharp qubit measurements in a sequential communication protocol.
The protocol involves three parties; the first party prepares a qubit system, the second party performs operations which return a classical and quantum outcome, and the latter is measured by the third party.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Unsharp measurements are increasingly important for foundational insights in
quantum theory and quantum information applications. Here, we report an
experimental implementation of unsharp qubit measurements in a sequential
communication protocol, based on a quantum random access code. The protocol
involves three parties; the first party prepares a qubit system, the second
party performs operations which return both a classical and quantum outcome,
and the latter is measured by the third party. We demonstrate a nearly-optimal
sequential quantum random access code that outperforms both the best possible
classical protocol and any quantum protocol which utilises only projective
measurements. Furthermore, while only assuming that the involved devices
operate on qubits and that detected events constitute a fair sample, we
demonstrate the noise-robust characterisation of unsharp measurements based on
the sequential quantum random access code. We apply this characterisation
towards quantifying the degree of incompatibility of two sequential pairs of
quantum measurements.
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