We propose a method of manipulating a quantum register remotely with the help
of a single ancilla that steers the evolution of the register. The fully
controlled ancilla qubit is coupled to the computational register solely via a
fixed unitary two-qubit interaction, E, and then measured in suitable bases. We
characterize all interactions E that induce a unitary, step-wise deterministic
measurement back-action on the register sufficient to implement any arbitrary
quantum channel. Our scheme offers significant experimental advantages for
implementing computations, preparing states and performing generalized
measurements as no direct control of the register is required.Comment: 4 pages, 3 figure

Anders, Janet

Andersson, Erika

Browne, Dan E.

Kashefi, Elham

Oi, Daniel K. L.

English

arXiv

We introduce a model of quantum computation intermediate between the gate-based and measurement-based models. A quantum register is manipulated remotely with the help of a single ancilla that "drives" the evolution of the register. The fully controlled ancilla qubit is coupled to the computational register only via a fixed unitary two-qubit interaction and then measured in suitable bases, driving both single- and two-qubit operations on the register. Arbitrary single- qubit operations directly on register qubits are not needed. We characterize all interactions E that induce a unitary, stepwise deterministic measurement back-action on the register sufficient to implement any quantum channel. Our scheme offers experimental advantages for computation, state preparation, and generalized measurements, since no tunable control of the register is required. <br/

Edinburgh Research Explorer

Ancilla-driven universal quantum computation

We introduce a model of quantum computation intermediate between the gate-based and measurement-based models. A quantum register is manipulated remotely with the help of a single ancilla that "drives" the evolution of the register. The fully controlled ancilla qubit is coupled to the computational register only via a fixed unitary two-qubit interaction and then measured in suitable bases, driving both single- and two-qubit operations on the register. Arbitrary single-qubit operations directly on register qubits are not needed. We characterize all interactions E that induce a unitary, stepwise deterministic measurement back-action on the register sufficient to implement any quantum channel. Our scheme offers experimental advantages for computation, state preparation, and generalized measurements, since no tunable control of the register is required. © 2010 The American Physical Society.</p

Oi, D. K L

Heriot Watt Pure

We introduce a model of quantum computation intermediate between the gate-based and measurement-based models. A quantum register is manipulated remotely with the help of a single ancilla that "drives" the evolution of the register. The fully controlled ancilla qubit is coupled to the computational register only via a fixed unitary two-qubit interaction and then measured in suitable bases, driving both single- and two-qubit operations on the register. Arbitrary single- qubit operations directly on register qubits are not needed. We characterize all interactions E that induce a unitary, stepwise deterministic measurement back-action on the register sufficient to implement any quantum channel. Our scheme offers experimental advantages for computation, state preparation, and generalized measurements, since no tunable control of the register is required

Name not available

University of Strathclyde Institutional Repository

http://dx.doi.org/10.1103/PhysRevA.82.020301

Ancilla-Driven Universal Quantum Computation

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Heriot Watt Pure

Heriot Watt Pure

Name not available

University of Strathclyde Institutional Repository