Streaming universal distortion-free entanglement concentration (2009)
Blume-Kohout, Robin, Croke, Sarah, Gottesman, Daniel
This paper presents a streaming (sequential) protocol for universal entanglement concentration at the Shannon bound. Alice and Bob begin with N identical (but unknown) two-qubit pure states, each...
Gate fidelity fluctuations and quantum process invariants (2009)
Magesan, Easwar, Blume-Kohout, Robin, Emerson, Joseph
We characterize the quantum gate fidelity in a state-independent manner by giving explicit expressions for the variance and a method for calculating all moments of the gate fidelity. We discuss a...
Quantum Darwinism in Quantum Brownian Motion (2008)
Blume-KoHout, Robin, Zurek, Wojciech H.
Quantum Darwinism—the redundant encoding of information about a decohering system in its environment—was proposed to reconcile the quantum nature of our Universe with apparent classicality. We...
Characterizing the Structure of Preserved Information in Quantum Processes (2008)
Blume-Kohout, Robin, Ng, Hui Khoon, Poulin, David, Viola, Lorenza
We introduce a general operational characterization of information-preserving structures—encompassing noiseless subsystems, decoherence-free subspaces, pointer bases, and error-correcting...
The structure of preserved information in quantum processes (2007)
Blume-Kohout, Robin, Ng, Hui Khoon, Poulin, David, Viola, Lorenza
We introduce a general operational characterization of information-preserving structures (IPS) -- encompassing noiseless subsystems, decoherence-free subspaces, pointer bases, and error-correcting...
Quantum Darwinism in quantum Brownian motion: the vacuum as a witness (2007)
Blume-Kohout, Robin, Zurek, Wojciech H.
We study quantum Darwinism -- the redundant recording of information about a decohering system by its environment -- in zero-temperature quantum Brownian motion. An initially nonlocal quantum state...
Optimal, reliable estimation of quantum states (2006)
Accurately inferring the state of a quantum device from the results of measurements is a crucial task in building quantum information processing hardware. The predominant state estimation procedure,...
Blume-Kohout, Robin, Zurek, Wojciech H.
We lay a comprehensive foundation for the study of redundant information storage in decoherence processes. Redundancy has been proposed as a prerequisite for objectivity, the defining property of...
Accurate quantum state estimation via "Keeping the experimentalist honest" (2006)
Blume-Kohout, Robin, Hayden, Patrick
In this article, we derive a unique procedure for quantum state estimation from a simple, self-evident principle: an experimentalist's estimate of the quantum state generated by an apparatus should...
Blume-Kohout, Robin, Zurek, W. H.
We lay a comprehensive foundation for the study of redundant information storage in decoherence processes. Redundancy has been proposed as a prerequisite for objectivity, the defining property of...
Blume-Kohout, Robin, Zurek, Wojciech H.
As quantum information science approaches the goal of constructing quantum computers, understanding loss of information through decoherence becomes increasingly important. The information about a...
Symmetric informationally complete quantum measurements (2004)
Renes, Joseph M., Blume-Kohout, Robin, Scott, Andrew James, Caves, Carlton M.
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Symmetric informationally complete quantum measurements (2004)
Renes, Joseph M., Blume-Kohout, Robin, Scott, Andrew James, Caves, Carlton M.
Physical-resource requirements and the power of quantum computation (2004)
Carlton M Caves, Robin Blume-kohout
doi:10.1088/1464-4266/6/8/027 The primary resource for quantum computation is the Hilbert-space dimension. Whereas Hilbert space itself is an abstract construction, the number of dimensions available...
Symmetric informationally complete quantum measurements (2004)
Renes, Joseph M., Blume-Kohout, Robin, Scott, Andrew James, Caves, Carlton M.
We consider the existence in arbitrary finite dimensions d of a positive operator valued measure (POVM) comprised of d2 rank-one operators all of whose operator inner products are equal. Such a set...
Symmetric Informationally Complete Quantum Measurements (2003)
Renes, Joseph M., Blume-Kohout, Robin, Scott, A. J., Caves, Carlton M.
We consider the existence in arbitrary finite dimensions d of a POVM comprised of d^2 rank-one operators all of whose operator inner products are equal. Such a set is called a ``symmetric,...
Poulin, David, Blume-Kohout, Robin, Laflamme, Raymond, Ollivier, Harold
We present an efficient quantum algorithm to measure the average fidelity decay of a quantum map under perturbation using a single bit of quantum information. Our algorithm scales only as the...
Physical-resource demands for scalable quantum computation (2003)
Caves, Carlton M., Deutsch, Ivan H., Blume-Kohout, Robin
The primary resource for quantum computation is Hilbert-space dimension. Whereas Hilbert space itself is an abstract construction, the number of dimensions available to a system is a physical...
Decoherence from a Chaotic Environment: An Upside Down "Oscillator" as a Model (2002)
Blume-Kohout, Robin, Zurek, Wojciech H.
Chaotic evolutions exhibit exponential sensitivity to initial conditions. This suggests that even very small perturbations resulting from weak coupling of a quantum chaotic environment to the...
Compatibility of quantum states (2002)
Poulin, David, Blume-Kohout, Robin
We introduce a measure of the compatibility between quantum states--the likelihood that two density matrices describe the same object. Our measure is motivated by two elementary requirements, which...
Climbing Mount Scalable: Physical-Resource Requirements for a Scalable Quantum Computer (2002)
Blume-Kohout, Robin, Caves, Carlton M., Deutsch, Ivan H.
The primary resource for quantum computation is Hilbert-space dimension. Whereas Hilbert space itself is an abstract construction, the number of dimensions available to a system is a physical...
Climbing mount scalable: Physical resource requirements for a scalable quantum computer (2002)
Robin Blume-kohout, Carlton M. Caves, Ivan H. Deutsch
The primary resource for quantum computation is Hilbert-space dimension. Whereas Hilbert space itself is an abstract construction, the number of dimensions available to a system is a physical...