Results 21 to 30 of about 161,178 (93)
Valence holes as Luttinger spinor based qubits in quantum dots
, 2009 We present a theory of valence holes as Luttinger spinor based qubits in p-doped self-assembled quantum dots within the 4-band $k\cdot p$ formalism. The two qubit levels are identified with the two chiralities of the doubly degenerate ground state.
A. Sachrajda +5 more
core +1 more source
, 2010 We investigate the spontaneous emission spectrum of a qubit in a lossy resonant cavity. We use neither the rotating-wave approximation nor the Markov approximation. The qubit-cavity coupling strength is varied from weak, to strong, even to lower bound of
Carmichael H J +10 more
core +1 more source
Few-qubit quantum refrigerator for cooling a multi-qubit system [PDF]
, 2020 We propose to use a few-qubit system as a compact quantum refrigerator for cooling an interacting multi-qubit system. We specifically consider a central qubit coupled to $N$ ancilla qubits in a so-called spin-star model as our quantum refrigerator. We first show that if the interaction between the qubits is of the longitudinal and ferromagnetic Ising ...
arxiv +1 more source
Optimal simulation of three-qubit gates [PDF]
, 2013 In this paper, we study the optimal simulation of three-qubit unitary by using two-qubit gates. First, we give a lower bound on the two-qubit gates cost of simulating a multi-qubit gate.
Ying, Mingsheng, Yu, Nengkun
core
A tunable coupling scheme for implementing high-fidelity two-qubit gates
, 2018 The prospect of computational hardware with quantum advantage relies critically on the quality of quantum gate operations. Imperfect two-qubit gates is a major bottleneck for achieving scalable quantum information processors.
Campbell, Dan +8 more
core +1 more source
Encoding a logical qubit into physical qubits [PDF]
, 2004 We propose two protocols to encode a logical qubit into physical qubits relying on common types of qubit-qubit interactions in as simple forms as possible. We comment on its experimental implementation in several quantum computing architectures, e.g.
arxiv +1 more source
Efficient one- and two-qubit pulsed gates for an oscillator stabilized Josephson qubit
, 2008 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, three loops, and a superconducting transmission line.
Aharonov D Ben-Or M +12 more
core +1 more source
Macroscopic Einstein-Podolsky-Rosen pairs in superconducting circuits
, 2005 We propose an efficient approach to prepare Einstein-Podolsky-Rosen (EPR) pairs in currently existing Josephson nanocircuits with capacitive couplings.
Franco Nori +7 more
core +1 more source
Improved qubit bifurcation readout in the straddling regime of circuit QED
, 2012 We study bifurcation measurement of a multi-level superconducting qubit using a nonlinear resonator biased in the straddling regime, where the resonator frequency sits between two qubit transition frequencies.
A. Blais +6 more
core +1 more source
Entanglement of formation for qubit-qudit system using partition of qudit sytem into a set of qubit system [PDF]
, 2013 Gerjuoy [Phys. Rev. A 67, 052308 (2003)] has derived a closed- form lower bound for the entanglement of formation of a mixed qubit-qudit system (qudit system has d levels with d>=3. In this paper, inspired by Gerjuoy's method, we propose a scheme that partitions a qubit-qudit system into d(d-1)/2 qubit-qubit systems, which can be treated by all known ...
arxiv +1 more source