843 citations · 3.6k across the 103 of their papers we have counts for
8 papers · 2 filters
Information vs. Disturbance in Dimension D
P. Oscar Boykin, Vwani P. Roychowdhury
We show that for Eve to get information in one basis about a state, she must cause errors in all bases that are mutually unbiased to that basis. Our result holds in any dimension.…
Bell-Correlated Activable Bound Entanglement in Multiqubit Systems
Somshubhro Bandyopadhyay, Indrani Chattopadhyay, Vwani P. Roychowdhury +1
We show that the Hilbert space of even number () of qubits can always be decomposed as a direct sum of four orthogonal subspaces such that the normalized projectors onto the…
Threshold Error Penalty for Fault Tolerant Computation with Nearest Neighbour Communication
T. Szkopek, P. O. Boykin, H. Fan +5
The error threshold for fault tolerant quantum computation with concatenated encoding of qubits is penalized by internal communication overhead. Many quantum computation proposals…
Optimal two-qubit quantum circuits using exchange interactions
Heng Fan, Vwani Roychowdhury, Thomas Szkopek
The Heisenberg exchange interaction is a natural method to implement non-local (i.e., multi-qubit) quantum gates in quantum information processing. We consider quantum circuits com…
Eigenvalue Estimation of Differential Operators
Thomas Szkopek, Vwani Roychowdhury, Eli Yablonovitch +1
We demonstrate how linear differential operators could be emulated by a quantum processor, should one ever be built, using the Abrams-Lloyd algorithm. Given a linear differential o…
Entanglement in a Valence-Bond-Solid State
Heng Fan, Vladimir Korepin, Vwani Roychowdhury
We study entanglement in Valence-Bond-Solid state. It describes the ground state of Affleck, Kennedy, Lieb and Tasaki quantum spin chain. The AKLT model has a gap and open boundary…