Manipulating a qubit through the backaction of sequential partial measurements and real-time feedback

Quantum measurements affect the state of the system, so they can be used both as probe and control knob. This idea is demonstrated in an experiment with nuclear spin qubits in diamond that are manipulated by measurements alone.

[1]  B. Hensen,et al.  High-fidelity projective read-out of a solid-state spin quantum register , 2011, Nature.

[2]  R Raussendorf,et al.  A one-way quantum computer. , 2001, Physical review letters.

[3]  Nan Zhao,et al.  Sensing single remote nuclear spins. , 2012, Nature nanotechnology.

[4]  R. Prevedel,et al.  High-speed linear optics quantum computing using active feed-forward , 2007, Nature.

[5]  Paola Cappellaro,et al.  Spin-bath narrowing with adaptive parameter estimation , 2012, 1203.1635.

[6]  D. Matsukevich,et al.  Entanglement of single-atom quantum bits at a distance , 2007, Nature.

[7]  A. N. Korotkov,et al.  Stabilizing Rabi oscillations in a superconducting qubit using quantum feedback , 2012, Nature.

[8]  C. Macklin,et al.  Observing single quantum trajectories of a superconducting quantum bit , 2013, Nature.

[9]  Franco Nori,et al.  Control-free control: Manipulating a quantum system using only a limited set of measurements , 2010, 1011.4463.

[10]  M. Markham,et al.  Heralded entanglement between solid-state qubits separated by three metres , 2012, Nature.

[11]  E. Knill,et al.  Realization of quantum error correction , 2004, Nature.

[12]  R. J. Schoelkopf,et al.  Quantum Back-Action of an Individual Variable-Strength Measurement , 2013, Science.

[13]  Morgan W. Mitchell,et al.  Interaction-based quantum metrology showing scaling beyond the Heisenberg limit , 2012 .

[14]  P Cappellaro,et al.  Coherence of an optically illuminated single nuclear spin qubit. , 2007, Physical review letters.

[15]  H M Wiseman,et al.  Measurement of quantum weak values of photon polarization. , 2005, Physical review letters.

[16]  M. Markham,et al.  Demonstration of entanglement-by-measurement of solid-state qubits , 2012, Nature Physics.

[17]  Howard M. Wiseman,et al.  Quantum control: Squinting at quantum systems , 2011, Nature.

[18]  S. Deleglise,et al.  Progressive field-state collapse and quantum non-demolition photon counting , 2007, Nature.

[19]  K J Resch,et al.  Experimental feedback control of quantum systems using weak measurements. , 2009, Physical review letters.

[20]  S. Bennett,et al.  Sensing distant nuclear spins with a single electron spin. , 2012, Physical review letters.

[21]  D. Berry,et al.  Entanglement-free Heisenberg-limited phase estimation , 2007, Nature.

[22]  L. DiCarlo,et al.  Initialization by measurement of a superconducting quantum bit circuit. , 2012, Physical review letters.

[23]  Mazyar Mirrahimi,et al.  Real-time quantum feedback prepares and stabilizes photon number states , 2011, Nature.

[24]  Vaidman,et al.  How the result of a measurement of a component of the spin of a spin-1/2 particle can turn out to be 100. , 1988, Physical review letters.

[25]  T Picot,et al.  Partial-measurement backaction and nonclassical weak values in a superconducting circuit. , 2013, Physical review letters.

[26]  A. Jordan,et al.  Weak values and the Leggett-Garg inequality in solid-state qubits. , 2007, Physical review letters.

[27]  T. Taminiau,et al.  Detection and control of individual nuclear spins using a weakly coupled electron spin. , 2012, Physical review letters.

[28]  A. Jordan,et al.  Qubit feedback and control with kicked quantum nondemolition measurements: A quantum Bayesian analysis , 2006, cond-mat/0606676.

[29]  A. Jordan,et al.  Contextual values of observables in quantum measurements. , 2009, Physical review letters.

[30]  C. Trautmann,et al.  Room-temperature entanglement between single defect spins in diamond , 2012, 1212.2804.

[31]  H. J. Kimble,et al.  Measurement-induced entanglement for excitation stored in remote atomic ensembles , 2005, Nature.

[32]  L. Diósi,et al.  Test of weak measurement on a two- or three-qubit computer , 2007, 0711.4149.

[33]  L. DiCarlo,et al.  Deterministic entanglement of superconducting qubits by parity measurement and feedback , 2013, Nature.