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Simplifying quantum logic using higher-dimensional Hilbert spaces
Quantum computation promises to solve fundamental, yet otherwise intractable, problems across a range of active fields of research. Recently, universal quantum logic-gate sets—the elemental building…
Preparation contextuality powers parity-oblivious multiplexing.
- R. Spekkens, D. H. Buzacott, A. Keehn, B. Toner, G. Pryde
- Computer SciencePhysical review letters
- 10 May 2008
It is demonstrated that a particular two-party information-processing task, "parity-oblivious multiplexing," is powered by contextuality in the sense that there is a limit to how well any theory described by a noncontextual hidden variable model can perform.
A strong no-go theorem on the Wigner’s friend paradox
Does quantum theory apply at all scales, including that of observers? New light on this fundamental question has recently been shed through a resurgence of interest in the long-standing Wigner’s…
How to perform the most accurate possible phase measurements
We present the theory of how to achieve phase measurements with the minimum possible variance in ways that are readily implementable with current experimental techniques. Measurements whose…
Entanglement-free Heisenberg-limited phase estimation
This work generalizes Kitaev’s phase estimation algorithm using adaptive measurement theory to achieve a standard deviation scaling at the Heisenberg limit, representing a drastic reduction in the complexity of achieving quantum-enhanced measurement precision.
Experimental Realization of a Quantum Autoencoder: The Compression of Qutrits via Machine Learning.
It is demonstrated that when the inherent structure of the dataset allows lossless compression, the autoencoder reduces qutrits to qubits with low error levels and is robust to perturbations during its optimization routine.
Unconditional violation of the shot-noise limit in photonic quantum metrology
Interferometric phase measurement is widely used to precisely determine quantities such as length, speed and material properties1–3. Without quantum correlations, the best phase sensitivity…
Demonstrating Heisenberg-limited unambiguous phase estimation without adaptive measurements
We derive, and experimentally demonstrate, an interferometric scheme for unambiguous phase estimation with precision scaling at the Heisenberg limit that does not require adaptive measurements. That…
A quantum Fredkin gate
The first quantum Fredkin gate is demonstrated and used to implement small-scale algorithms and produce high-fidelity GHZ states, and paves the way for larger controlled circuits to be realized efficiently.
Observation of Genuine One-Way Einstein-Podolsky-Rosen Steering.
The one-way steerability of an experimentally practical class of entangled states in this general setting is proved and the demonstration of fundamentally asymmetric nonlocality also has practical implications for the distribution of the trust in quantum communication networks.