398 citations
- IBM (United States)US7 papers
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- California Institute of TechnologyUS2 papers
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- AT&T (United States)US1 paper
- Austrian Academy of SciencesAT1 paper
- Cancer Research UKGB1 paper
- Cancer Research UK Cambridge CenterGB1 paper
- Centre de Mathématiques Appliquées de l'École polytechniqueFR1 paper
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11 papers · 1 filter
Can closed timelike curves or nonlinear quantum mechanics improve quantum state discrimination or help solve hard problems?
Charles H. Bennett, Debbie Leung, Graeme Smith +1
We study the power of closed timelike curves (CTCs) and other nonlinear extensions of quantum mechanics for distinguishing nonorthogonal states and speeding up hard computations. I…
High performance single-error-correcting quantum codes for amplitude damping
Peter W. Shor, Graeme Smith, John A. Smolin +1
We construct families of high performance quantum amplitude damping codes. All of our codes are nonadditive and most modestly outperform the best possible additive codes in terms o…
Extensive nonadditivity of privacy
Graeme Smith, John A. Smolin
Quantum information theory establishes the ultimate limits on communication and cryptography in terms of channel capacities for various types of information. The private capacity i…
Generalized Concatenated Quantum Codes
Markus Grassl, Peter Shor, Graeme Smith +2
We introduce the concept of generalized concatenated quantum codes. This generalized concatenation method provides a systematical way for constructing good quantum codes, both stab…
Can non-private channels transmit quantum information?
Graeme Smith, John Smolin
We study the power of quantum channels with little or no capacity for private communication. Because privacy is a necessary condition for quantum communication, one might expect th…
Efficient one- and two-qubit pulsed gates for an oscillator stabilized Josephson qubit
Frederico Brito, David P. DiVincenzo, Roger H. Koch +1
We present theoretical schemes for performing high-fidelity one- and two-qubit pulsed gates for a superconducting flux qubit. The "IBM qubit" consists of three Josephson junctions,…