10.9k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- University of TsukubaJP1.6k papers
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15 papers · 2 filters
Random unitary maps for quantum state reconstruction
Seth T. Merkel, Carlos A. Riofrio, Steven T. Flammia +1
We study the possibility of performing quantum state reconstruction from a measurement record that is obtained as a sequence of expectation values of a Hermitian operator evolving…
Ensemble Steering, Weak Self-Duality, and the Structure of Probabilistic Theories
Howard Barnum, Carl Phillipp Gaebler, Alexander Wilce
In any probabilistic theory, we may say a bipartite state on a composite system AB steers its marginal state (on, say, system B) if, for any decomposition of the marginal as a mixt…
Collective Uncertainty in Partially-Polarized and Partially-Decohered Spin-1/2 Systems
Ben Q. Baragiola, Bradley A. Chase, JM Geremia
It has become common practice to model large spin ensembles as an effective pseudospin with total angular momentum J = N x j, where j is the spin per particle. Such approaches (at…
Quantum control and measurement of atomic spins in polarization spectroscopy
Ivan H. Deutsch, Poul S. Jessen
Quantum control and measurement are two sides of the same coin. To affect a dynamical map, well-designed time-dependent control fields must be applied to the system of interest. To…
Quantum-circuit guide to optical and atomic interferometry
Carlton M. Caves, Anil Shaji
Atomic (qubit) and optical or microwave (modal) phase-estimation protocols are placed on the same footing in terms of quantum-circuit diagrams. Circuit equivalences are used to dem…
Fabrication of Diamond Nanowires for Quantum Information Processing Applications
Birgit Hausmann, Mughees Khan, Tom Babinec +5
We present a design and a top-down fabrication method for realizing diamond nanowires in both bulk single crystal and polycrystalline diamond. Numerical modeling was used to study…
Wigner's inequalities in quantum field theory
Nikolai Nikitin, Konstantin Toms
We present a relativistic generalization of the Wigner inequality for the scalar and pseudoscalar particles decaying to two particles with spin (fermions and photons.) We consider…
Bounds on the quantum satisfiability threshold
Sergey Bravyi, Cristopher Moore, Alexander Russell
Quantum k-SAT is the problem of deciding whether there is a n-qubit state which is perpendicular to a set of vectors, each of which lies in the Hilbert space of k qubits. Equivalen…
Quantum-limited metrology and Bose-Einstein condensates
Sergio Boixo, Animesh Datta, Matthew J. Davis +3
We discuss a quantum-metrology protocol designed to estimate a physical parameter in a Bose-Einstein condensate of N atoms, and we show that the measurement uncertainty can decreas…
Controlling nuclear spin exchange via optical Feshbach resonances in Yb
Iris Reichenbach, Paul S. Julienne, Ivan H. Deutsch
Nuclear spin exchange occurs in ultracold collisions of fermionic alkaline-earth-like atoms due to a difference between s- and p-wave phase shifts. We study the use of an optical F…
Coherent control of atomic transport in spinor optical lattices
Brian E. Mischuck, Poul S. Jessen, Ivan H. Deutsch
Coherent transport of atoms trapped in an optical lattice can be controlled by microwave-induced spin flips that correlate with site-to-site hopping. We study the controllability o…
Repeatable procedures and maps in open quantum dynamics
Thomas F. Jordan, Anil Shaji
Examples of repeatable procedures and maps are found in the open quantum dynamics of one qubit that interacts with another qubit. They show that a mathematical map that is repeatab…
Magnetometry via a double-pass continuous quantum measurement of atomic spin
Bradley A. Chase, Ben Q. Baragiola, Heather L. Partner +2
We argue that it is possible in principle to reduce the uncertainty of an atomic magnetometer by double-passing a far-detuned laser field through the atomic sample as it undergoes…
Open quantum system approach to single-molecule spectroscopy
Adrian A. Budini
In this paper, single-molecule spectroscopy experiments based on continuous laser excitation are characterized through an open quantum system approach. The evolution of the fluorop…
Constructing General Unitary Maps from State Preparations
Seth T. Merkel, Gavin Brennen, Poul S. Jessen +1
We present an efficient algorithm for generating unitary maps on a -dimensional Hilbert space from a time-dependent Hamiltonian through a combination of stochastic searches and…