Eigenpath traversal by phase randomization (2009)
Boixo, Sergio, Knill, Emanuel, Somma, Rolando
A computation in adiabatic quantum computing is implemented by traversing a path of nondegenerate eigenstates of a continuous family of Hamiltonians. We introduce a method that traverses a...
Quantum-limited metrology and Bose-Einstein condensates (2009)
Boixo, Sergio, Datta, Animesh, Davis, Matthew J., Shaji, Anil, Tacla, Alexandre B., Caves, Carlton M.
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 decrease faster than 1/N....
Quantum-limited metrology and Bose-Einstein condensates (2009)
Boixo, Sergio, Datta, Animesh, Davis, Matthew J., Shaji, Anil, Tacla, Alexandre B., Caves, Carlton M.
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 decrease faster than 1/N....
Quantum Metrology: Dynamics vs. Entanglement (2008)
Boixo, Sergio, Datta, Animesh, Davis, Matthew J., Flammia, Steven T., Shaji, Anil, Caves, Carlton M.
A parameter whose coupling to a quantum probe of $n$ constituents includes all two-body interactions between the constituents can be measured with an uncertainty that scales as $1/n^{3/2}$, even when...
Quantum metrology: Dynamics versus entanglement (2008)
Boixo, Sergio, Datta, Animesh, Davis, Matthew J., Flammia, Steven T., Shaji, Anil, Caves, Carlton M.
A parameter whose coupling to a quantum probe of n constituents includes all two-body interactions between the constituents can be measured with an uncertainty that scales as 1/n3/2, even when the...
Quantum-limited metrology with product states (2008)
Boixo, Sergio, Datta, Animesh, Flammia, Steven T., Shaji, Anil, Bagan, Emilio, Caves, Carlton M.
We study the performance of initial product states of n-body systems in generalized quantum metrology protocols that involve estimating an unknown coupling constant in a nonlinear k-body (kn)...
Quantum-limited metrology with product states (2007)
Boixo, Sergio, Datta, Animesh, Flammia, Steven T., Shaji, Anil, Bagan, Emilio, Caves, Carlton M.
We study the performance of initial product states of n-body systems in generalized quantum metrology protocols that involve estimating an unknown coupling constant in a nonlinear k-body (k
Parameter Estimation with Mixed-State Quantum Computation (2007)
Somma, Rolando D., Boixo, Sergio
We present a quantum algorithm to estimate parameters at the quantum metrology limit using deterministic quantum computation with one bit. When the interactions occurring in a quantum system are...
An operational interpretation for multipartite entanglement (2007)
We introduce an operational interpretation for pure-state global multipartite entanglement based on quantum estimation. We show that the estimation of the strength of low-noise locally depolarizing...
Generalized Limits for Single-Parameter Quantum Estimation (2006)
Boixo, Sergio, Flammia, Steven T., Caves, Carlton M., Geremia, JM
We develop generalized bounds for quantum single-parameter estimation problems for which the coupling to the parameter is described by intrinsic multi-system interactions. For a Hamiltonian with...
Generalized Coherent States as Preferred States of Open Quantum Systems (2006)
Boixo, Sergio, Viola, Lorenza, Ortiz, Gerardo
We investigate the connection between quasi-classical (pointer) states and generalized coherent states (GCSs) within an algebraic approach to Markovian quantum systems (including bosons, spins, and...
On Decoherence in Quantum Clock Synchronization (2006)
Boixo, Sergio, Caves, Carlton M., Datta, Animesh, Shaji, Anil
We study two quantum versions of the Eddington clock-synchronization protocol in the presence of decoherence. The first protocol uses maximally entangled states to achieve the Heisenberg limit for...