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- Giulio Chiribella, Giacomo Mauro Dâ€™Ariano, Paolo Perinotti
- 2010

We investigate general probabilistic theories in which every mixed state has a purification, unique up to reversible channels on the purifying system. We show that the purification principle isâ€¦ (More)

- Giulio Chiribella, Giacomo Mauro Dâ€™Ariano, Paolo Perinotti
- 2011

More than 80 years after its formulation, quantum theory is still mysterious. The theory has a solid mathematical foundation, addressed by Hilbert, von Neumann, and Nordheim in 1928 [1] and broughtâ€¦ (More)

- Giulio Chiribella, Giacomo Mauro D'Ariano, Paolo Perinotti
- Physical review letters
- 2008

We present a method for optimizing quantum circuits architecture, based on the notion of a quantum comb, which describes a circuit board where one can insert variable subcircuits. Unexplored quantumâ€¦ (More)

- Giulio Chiribella
- Int. J. Software and Informatics
- 2014

We propose a notion of state distinguishability that does not refer to probabilities, but rather to the ability of a set of states to serve as programs for a desired set of gates. Using this notion,â€¦ (More)

- Giulio Chiribella, Giacomo Mauro D'Ariano, Paolo Perinotti, Massimiliano F. Sacchi
- Physical review letters
- 2004

We propose a covariant protocol for transmitting reference frames encoded on N spins, achieving sensitivity N-2 without the need of a preestablished reference frame and without using entanglementâ€¦ (More)

- Giulio Chiribella, Giacomo Mauro D'Ariano, Dirk Schlingemann
- Physical review letters
- 2007

We show that in finite dimensions a quantum measurement with a continuous set of outcomes can be always realized as a continuous random choice of measurements with a finite number of outcomes.

- Giulio Chiribella, Y Yang, C Huang
- Physical review letters
- 2015

Quantum states obey an asymptotic no-cloning theorem, stating that no deterministic machine can reliably replicate generic sequences of identically prepared pure states. In stark contrast, we showâ€¦ (More)

- B. Gendra, John Calsamiglia, Ramon Munoz-Tapia, Emilio Bagan, Giulio Chiribella
- Physical review letters
- 2014

It has recently been shown that probabilistic protocols based on postselection boost the performances of the replication of quantum clocks and phase estimation. Here we demonstrate that theâ€¦ (More)

- Giulio Chiribella, G. M. Dâ€™Ariano, Massimiliano F. Sacchi
- 2005

We derive the optimal input states and the optimal quantum measurements for estimating the unitary action of a given symmetry group, showing how the optimal performance is obtained with a suitableâ€¦ (More)

- Giulio Chiribella
- TQC
- 2010

This paper presents a series of results on the interplay between quantum estimation, cloning and finite de Finetti theorems. First, we consider the measure-and-prepare channel that uses optimalâ€¦ (More)