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23 papers · 2 filters
Three-dimensional light-matter interface for collective spin squeezing in atomic ensembles
Ben Q. Baragiola, Leigh M. Norris, Enrique Montano +3
We study the three-dimensional nature of the quantum interface between an ensemble of cold, trapped atomic spins and a paraxial laser beam, coupled through a dispersive interaction…
Global versus local optimality in feedback-controlled qubit purification: new insights from minimizing Rényi entropies
Colin Teo, Joshua Combes, Howard M. Wiseman
It was first shown by Jacobs, in 2003, that the process of qubit state purification by continuous measurement of one observable can be enhanced, on average, by unitary feedback con…
Improved Bounds for Eigenpath Traversal
Hao-Tien Chiang, Guanglei Xu, Rolando D. Somma
We present a bound on the length of the path defined by the ground states of a continuous family of Hamiltonians in terms of the spectral gap G. We use this bound to obtain a signi…
Quantum Hamiltonian Learning Using Imperfect Quantum Resources
Nathan Wiebe, Christopher Granade, Christopher Ferrie +1
Identifying an accurate model for the dynamics of a quantum system is a vexing problem that underlies a range of problems in experimental physics and quantum information theory. Re…
Jordan-Wigner formalism for arbitrary 2-input 2-output matchgates and their classical simulation
Richard Jozsa, Akimasa Miyake, Sergii Strelchuk
In Valiant's matchgate theory, 2-input 2-output matchgates are 4x4 matrices that satisfy ten so-called matchgate identities. We prove that the set of all such matchgates (including…
Quantum mechanical retrodiction through an extended mean King problem
Amir Kalev, Ady Mann, Michael Revzen
The mean King problem is a conditional retrodiction problem. In this problem Alice prepares a two prime-dimensional particles state and avails one of the particles to the King who…