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Quantum
Information and Computation
ISSN: 1533-7146
published since 2001
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Vol.2 No.3, April 2002 |
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Quantum
algorithm for measuring the energy of n qubits with unknown
pair-interactions
(pp198-207)
Dominik
Janzing
doi:
https://doi.org/10.26421/QIC2.3-3
Abstracts:
The well-known algorithm
for quantum phase estimation requires that the considered unitary is
available as a conditional transformation depending on the quantum state
of an ancilla register. We present an algorithm converting an unknown n-qubit
pair-interaction Hamiltonian into a conditional one such that standard
phase estimation can be applied to measure the energy. Our essential
assumption is that the considered system can be brought into interaction
with a quantum computer. For large n the algorithm could still be
applicable for estimating the density of energy states and might
therefore be useful for finding energy gaps in solid states.
Key words:
measurements, energy gaps, quantum phase estimation, spectral gaps |
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