Frontiers of quantum physics

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How to Teach AI to Play Bell Non-Local Games: Reinforcement Learning

(2019)

Authors:

Kishor Bharti, Tobias Haug, Vlatko Vedral, Leong-Chuan Kwek
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Theoretical description and experimental simulation of quantum entanglement near open time-like curves via pseudo-density operators

(2019)

Authors:

C Marletto, V Vedral, S Virzì, E Rebufello, A Avella, F Piacentini, M Gramegna, IP Degiovanni, M Genovese
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Phase diffusion and the small-noise approximation in linear amplifiers: Limitations and beyond

Quantum Verein zur Forderung des Open Access Publizierens in den Quantenwissenschaften 3 (2019) 200

Authors:

Andy Chia, Michal Hajdušek, Rosario Fazio, Leong-Chuan Kwek, Vlatko Vedral
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Is the fermionic exchange phase also acquired locally?

Journal of Physics Communications IOP Publishing 3:11 (2019) 111001

Authors:

Chiara Marletto, Vlatko Vedral
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Modular quantum computation in a trapped ion system

Nature Communications Springer Nature 10:1 (2019) ARTN 4692

Authors:

Kuan Zhang, Jayne Thompson, Xiang Zhang, Yangchao Shen, Yao Lu, Shuaining Zhang, Jiajun Ma, Vlatko Vedral, Mile Gu, Kihwan Kim

Abstract:

Modern computation relies crucially on modular architectures, breaking a complex algorithm into self-contained subroutines. A client can then call upon a remote server to implement parts of the computation independently via an application programming interface (API). Present APIs relay only classical information. Here we implement a quantum API that enables a client to estimate the absolute value of the trace of a server-provided unitary operation [Formula: see text]. We demonstrate that the algorithm functions correctly irrespective of what unitary [Formula: see text] the server implements or how the server specifically realizes [Formula: see text]. Our experiment involves pioneering techniques to coherently swap qubits encoded within the motional states of a trapped [Formula: see text] ion, controlled on its hyperfine state. This constitutes the first demonstration of modular computation in the quantum regime, providing a step towards scalable, parallelization of quantum computation.
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